Method and apparatus for transmitting uplink control channel in wireless cellular communication system

ABSTRACT

The present disclosure relates to a communication technique and system thereof that fuses a 5G communication system with IoT technology to support a higher data rate than a 4G system. The present disclosure may be applied to an intelligent service (for example, a smart home, a smart building, a smart city, a smart car or a connected car, health care, digital education, retail, a security and safety related service, etc.) on the basis of 5G communication technology and IoT-related technology. According to the present invention, a method of a terminal in a wireless communication system comprises the steps of: detecting a synchronization signal block at a synchronization signal block candidate position which is determined according to a subcarrier interval of the synchronization signal block; and performing synchronization on the basis of the synchronization signal block.

TECHNICAL FIELD

The disclosure relates a method and an apparatus for transmitting anuplink control channel in a wireless cellular communication system.

The disclosure further relates to a method of transmitting and receivinga synchronization signal in a wireless communication system.

The disclosure further relates to a method and an apparatus for sharingresources of a data channel and a control channel in a wirelesscommunication system.

BACKGROUND ART

To meet the demand for wireless data traffic having increased sincedeployment of 4G communication systems, efforts have been made todevelop an improved 5G or pre-5G communication system. Therefore, the 5Gor pre-5G communication system is also called a ‘Beyond 4G Network’ or a‘Post LTE System’. The 5G communication system is considered to beimplemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, soas to accomplish higher data rates. To decrease propagation loss of theradio waves and increase the transmission distance, the beamforming,massive multiple-input multiple-output (MIMO), Full Dimensional MIMO(FD-MIMO), array antenna, an analog beam forming, large scale antennatechniques are discussed in 5G communication systems. In addition, in 5Gcommunication systems, development for system network improvement isunder way based on advanced small cells, cloud Radio Access Networks(RANs), ultra-dense networks, device-to-device (D2D) communication,wireless backhaul, moving network, cooperative communication,Coordinated Multi-Points (CoMP), reception-end interference cancellationand the like. In the 5G system, Hybrid FSK and QAM Modulation (FQAM) andsliding window superposition coding (SWSC) as an advanced codingmodulation (ACM), and filter bank multi carrier (FBMC), non-orthogonalmultiple access (NOMA), and sparse code multiple access (SCMA) as anadvanced access technology have been developed.

The Internet, which is a human centered connectivity network wherehumans generate and consume information, is now evolving to the Internetof Things (IoT) where distributed entities, such as things, exchange andprocess information without human intervention. The Internet ofEverything (IoE), which is a combination of the IoT technology and theBig Data processing technology through connection with a cloud server,has emerged. As technology elements, such as “sensing technology”,“wired/wireless communication and network infrastructure”, “serviceinterface technology”, and “Security technology” have been demanded forIoT implementation, a sensor network, a Machine-to-Machine (M2M)communication, Machine Type Communication (MTC), and so forth have beenrecently researched. Such an IoT environment may provide intelligentInternet technology services that create a new value to human life bycollecting and analyzing data generated among connected things. IoT maybe applied to a variety of fields including smart home, smart building,smart city, smart car or connected cars, smart grid, health care, smartappliances and advanced medical services through convergence andcombination between existing Information Technology (IT) and variousindustrial applications.

In line with this, various attempts have been made to apply 5Gcommunication systems to IoT networks. For example, technologies such asa sensor network, Machine Type Communication (MTC), andMachine-to-Machine (M2M) communication may be implemented bybeamforming, MIMO, and array antennas. Application of a cloud RadioAccess Network (RAN) as the above-described Big Data processingtechnology may also be considered to be as an example of convergencebetween the 5G technology and the IoT technology.

According to the recent development of long-term evolution (LTE) andLTE-Advanced, research on a method of transmitting an uplink controlchannel in a wireless cellular communication system has been activelyconducted.

DETAILED DESCRIPTION OF THE INVENTION Technical Problem

An aspect of the disclosure is to provide a method of indicating a longPUCCH transmission interval (or a start symbol and an end symbol) and anapparatus for the same in order to prevent resource collision andmaximize resource use when uplink control channels such as a long PUCCH,a short PUCCH, or a sound reference signal (SRS) coexist in one TTI orone slot.

Another aspect of the disclosure is to provide an efficientsynchronization signal transmission/reception method in a mobilecommunication system.

Another aspect of the disclosure is to provide downlink controlsignaling to support transmission of downlink and uplink transmissionchannels in a wireless communication system. Control signals in theconventional 4G LTE system include downlink scheduling allocationincluding information required by the UE for appropriately receiving,demodulating, and decoding a physical downlink shared channel (PDSCH),uplink scheduling grant which informs of resources and a transmissionformat used by the UE for a physical uplink shared channel (PUSCH), andinformation on acknowledgement of hybrid automatic repeat request (HARQ)for a PUSCH.

In LTE, there is a physical downlink control channel (PDCCH) which is aphysical layer transport channel for transmitting the downlinkscheduling allocation and the uplink scheduling grant, which istransmitted in a front part of each subframe over the entire band. Thatis, the subframe may be divided into a control region and a data region,and the size of the control region may be designed to occupy 1, 2, or 3orthogonal frequency division multiplexing (OFDM) symbols. The size ofthe control region, which is expressed by the number of OFDM symbols,may be dynamically changed according to special conditions such as thesize of a system bandwidth and whether a multimedia broadcast singlefrequency network (MBSFN) subframe for broadcasting is configured, andmay be indicated to each UE through a control format indicator (CFI).

Meanwhile, unlike the prior art, a 5G wireless communication systemsupports not only a service requiring a high transmission rate but alsoboth a service having a very short transmission delay and a servicerequiring a high connection density. Such scenarios should be able toprovide different transmission/reception schemes in one system andvarious services having transmission/reception parameters in order tomeet various requirements of users and services, and it is important todesign the scenarios so as to avoid creating limitations by whichaddition of services is limited by the current system from the aspect offorward compatibility. For example, scalable numerology may be used forspacing between subcarriers and may be simultaneously supported, orvarious services having different transmission time intervals (TTIs) maybe simultaneously provided in one system. 5G should necessarily use timeand frequency resources more flexibly than LTE.

The PDCCH used in LTE is not suitable for securing flexibility becausethe PDCCH is transmitted over the entire band the size of the controlregion is UE-specifically configured. Accordingly, under considerationfor implementation in the 5G wireless communication system is astructure in which the control channel can be flexibly allocatedaccording to various requirements of services. For example, a controlregion (control resource set) defined as a time and frequency region inwhich a 5G downlink control channel is transmitted is not configured asthe entire band on the frequency axis but may be configured as specificsubbands and may be configured to be the number of different OFDMsymbols on the time axis. The number of control regions within onesystem may be plural, and a plurality of control regions may beconfigured to one UE. Accordingly, the control region may be efficientlymanaged according to whether a downlink control signal is transmitted,and accordingly, various services may be flexibly supported.

Particularly, in order to increase the efficiency of use of resources in5G, data channels may be multiplexed through the remaining resourceswhich are not actually used for downlink control information (DCI)transmission within the control region. At this time, a symbol at thelocation at which the data channel starts may differ according towhether there is a control region at the frequency location at which thedata channel is transmitted or whether the control region is reused.Accordingly, the UE may receive an indication of a data start point todecode the data channel. Further, an indicator of the data start pointmay have different overheads depending on the method of in whichresources are shared between the control channel and the data channel.Accordingly, efficient BS and UE operations to minimize signalingoverhead and maximize resource efficiency are required. Therefore, thedisclosure provides a method of efficiently sharing resources betweenthe data channel and the control channel in 5G and a method and anapparatus for additional signaling to support the same.

Solution to Problem

In accordance with an aspect of the disclosure, a method of a userequipment (UE) in a wireless communication system includes: detecting asynchronization signal block at a synchronization signal block candidatelocation determined according to subcarrier spacing of synchronizationsignal blocks; and performing synchronization based on thesynchronization signal block.

In accordance with another aspect of the disclosure, a method of a basestation (BS) in a wireless communication system includes: transmitting asynchronization signal block at a synchronization signal block candidatelocation determined according to subcarrier spacing of thesynchronization signal block, wherein synchronization is performed basedon the synchronization signal block.

In accordance with another aspect of the disclosure, a user equipment(UE) in a wireless communication system includes: a transceiver; and acontroller configured to detect a synchronization signal block at asynchronization signal block candidate location determined according tosubcarrier spacing of the synchronization signal block and performsynchronization, based on the synchronization signal block.

In accordance with another aspect of the disclosure, a base station (BS)in a wireless communication system includes: a transceiver; and acontroller configured to transmit a synchronization signal block at asynchronization signal block candidate location determined according tosubcarrier spacing of the synchronization signal block, whereinsynchronization is performed based on the synchronization signal block.

Advantageous Effects of Invention

According to an embodiment of the disclosure, the disclosure proposes amethod of indicating a long PUCCH transmission interval (or a startsymbol and an end symbol) if uplink control channels such as a longPUCCH, a short PUCCH, or an SRS should be transmitted within one TTI orone slot. When UEs transmit uplink control channels such as a longPUCCH, a short PUCCH, or an SRS, it is possible to prevent resourcecollision between UEs and maximize the resource use of the BS throughthe method proposed by the disclosure.

According to another embodiment of the disclosure, the disclosuredefines a synchronization signal transmission/reception method in amobile communication system, and thus improves system efficiency andreduces synchronization signal detection complexity of the UE.

According to another embodiment of the disclosure, the disclosure mayprovide a method and an apparatus for sharing resources between adownlink control channel and a downlink data channel in a 5Gcommunication system, thereby more efficiently operating the 5G system.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 illustrates the basic structure of a time/frequency region in anLTE system;

FIG. 2 illustrates an example in which 5G services are multiplexed inone system;

FIG. 3 illustrates an embodiment of a communication system to which thedisclosure is applied;

FIG. 4 illustrates embodiment 1-1 according to the disclosure;

FIGS. 5A and 5B illustrate BS and UE procedures according to embodiment1-1 of the disclosure;

FIG. 6 illustrates embodiment 1-2 according to the disclosure;

FIGS. 7A and 7B illustrate BS and UE procedures according to embodiment1-2 of the disclosure;

FIG. 8 illustrates a BS apparatus according to the disclosure;

FIG. 9 illustrates a UE apparatus according to the disclosure;

FIG. 10 illustrates the basic structure of a time-frequency resourceregion, which is a radio resource region in which a data or controlchannel of LTE and LTE-A systems are transmitted;

FIG. 11 illustrates an example of an expanded frame structure of a 5Gsystem;

FIG. 12 illustrates another example of an expanded frame structure of a5G system;

FIG. 13 illustrates another example of an expanded frame structure of a5G system;

FIG. 14 illustrates a time region mapping structure of a synchronizationsignal and a beam-sweeping operation;

FIGS. 15 A, 15B, and 15C illustrate the configuration of SS blocks;

FIG. 16 illustrates various slot formats;

FIGS. 17A, 17B, 17C, 17D, 17E, 17F, 17G, 17H, 17I, 17J, 17K, 17L, 17M,17N, 17O, and 17P illustrate a method of mapping SS blocks;

FIGS. 18A 18B, 18C, 18D, 18E, 18F, 18G, 18H, 18I, 18J, 18K, 18L, 18M,and 18N illustrate another method of mapping SS blocks;

FIG. 19 illustrates an example of SS-block mapping varying depending onsubcarrier spacing of a data channel;

FIG. 20 illustrates an example of fixed SS-block mapping regardless ofsubcarrier spacing of a data channel;

FIG. 21 illustrates another example of fixed SS-block mapping regardlessof subcarrier spacing of a data channel;

FIG. 22 illustrates another example of fixed SS-block mapping regardlessof subcarrier spacing of a data channel;

FIG. 23 illustrates another example of fixed SS-block mapping regardlessof subcarrier spacing of a data channel;

FIGS. 24A and 24B illustrate a method of mapping SS blocks within an SSburst set period;

FIGS. 25A and 25B illustrate another method of mapping SS blocks withinan SS burst set period;

FIG. 26 illustrates an initial access procedure of a UE;

FIG. 27 illustrates a procedure of detecting an SS block according to aconnection state of the UE;

FIG. 28 illustrates UE transmission and reception devices;

FIG. 29 illustrates a PDCCH and an EPDCCH which are downlink controlchannels of LTE;

FIG. 30 illustrates a 5G downlink control channel;

FIG. 31 illustrates resource region allocation in a 5G downlink controlchannel;

FIG. 32 illustrates a source allocation method of a 5G downlink controlchannel;

FIG. 33 illustrates embodiment 3-1 of the disclosure;

FIG. 34 illustrates embodiment 3-2 of the disclosure;

FIGS. 35A and 358 illustrate BS and UE operations according to thedisclosure;

FIG. 36 illustrates embodiment 3-3 of the disclosure;

FIGS. 37A and 37B illustrate BS and UE operations according toembodiment 3-3 of the disclosure;

FIG. 38 illustrates embodiment 3-4 of the disclosure;

FIGS. 39A and 39B illustrate BS and UE operations according toembodiment 3-4 of the disclosure;

FIG. 40 illustrates a fifth embodiment of the disclosure;

FIGS. 41A and 41B illustrate BS and UE operations according to the fifthembodiment of the disclosure;

FIG. 42 is a block diagram illustrating the interval structure a UEaccording to an embodiment of the disclosure; and

FIG. 43 is a block diagram illustrating the interval structure of a BSaccording to an embodiment of the disclosure.

MODE FOR THE INVENTION

Hereinafter, embodiments of the disclosure will be described in detailin conjunction with the accompanying drawings. In the followingdescription of the disclosure, a detailed description of known functionsor configurations incorporated herein will be omitted when it may makethe subject matter of the disclosure rather unclear. The terms whichwill be described below are terms defined in consideration of thefunctions in the disclosure, and may be different according to users,intentions of the users, or customs. Therefore, the definitions of theterms should be made based on the contents throughout the specification.

The advantages and features of the disclosure and ways to achieve themwill be apparent by making reference to embodiments as described belowin detail in conjunction with the accompanying drawings. However, thedisclosure is not limited to the embodiments set forth below, but may beimplemented in various different forms. The following embodiments areprovided only to completely disclose the disclosure and inform thoseskilled in the art of the scope of the disclosure, and the disclosure isdefined only by the scope of the appended claims. Throughout thespecification, the same or like reference numerals designate the same orlike elements.

First Embodiment

Hereinafter, embodiments of the disclosure will be described in detailin conjunction with the accompanying drawings. In the followingdescription of the disclosure, a detailed description of known functionsor configurations incorporated herein will be omitted when it may makethe subject matter of the disclosure rather unclear. The terms whichwill be described below are terms defined in consideration of thefunctions in the disclosure, and may be different according to users,intentions of the users, or customs. Therefore, the definitions of theterms should be made based on the contents throughout the specification.

The advantages and features of the disclosure and ways to achieve themwill be apparent by making reference to embodiments as described belowin detail in conjunction with the accompanying drawings. However, thedisclosure is not limited to the embodiments set forth below, but may beimplemented in various different forms. The following embodiments areprovided only to completely disclose the disclosure and inform thoseskilled in the art of the scope of the disclosure, and the disclosure isdefined only by the scope of the appended claims. Throughout thespecification, the same or like reference numerals designate the same orlike elements.

Here, it will be understood that each block of the flowchartillustrations, and combinations of blocks in the flowchartillustrations, can be implemented by computer program instructions.These computer program instructions can be provided to a processor of ageneral purpose computer, special purpose computer, or otherprogrammable data processing apparatus to produce a machine, such thatthe instructions, which execute via the processor of the computer orother programmable data processing apparatus, create means forimplementing the functions specified in the flowchart block or blocks.These computer program instructions may also be stored in a computerusable or computer-readable memory that can direct a computer or otherprogrammable data processing apparatus to function in a particularmanner, such that the instructions stored in the computer usable orcomputer-readable memory produce an article of manufacture includinginstruction means that implement the function specified in the flowchartblock or blocks. The computer program instructions may also be loadedonto a computer or other programmable data processing apparatus to causea series of operational steps to be performed on the computer or otherprogrammable apparatus to produce a computer implemented process suchthat the instructions that execute on the computer or other programmableapparatus provide steps for implementing the functions specified in theflowchart block or blocks.

And each block of the flowchart illustrations may represent a module,segment, or portion of code, which includes one or more executableinstructions for implementing the specified logical function(s). Itshould also be noted that in some alternative implementations, thefunctions noted in the blocks may occur out of the order. For example,two blocks shown in succession may in fact be executed substantiallyconcurrently or the blocks may sometimes be executed in the reverseorder, depending upon the functionality involved.

As used herein, the “unit” refers to a software element or a hardwareelement, such as a Field Programmable Gate Array (FPGA) or anApplication Specific Integrated Circuit (ASIC), which performs apredetermined function. However, the “unit does not always have ameaning limited to software or hardware. The “unit” may be constructedeither to be stored in an addressable storage medium or to execute oneor more processors. Therefore, the “unit” includes, for example,software elements, object-oriented software elements, class elements ortask elements, processes, functions, properties, procedures,sub-routines, segments of a program code, drivers, firmware,micro-codes, circuits, data, database, data structures, tables, arrays,and parameters. The elements and functions provided by the “unit” may beeither combined into a smaller number of elements, “unit” or dividedinto a larger number of elements, “unit”. Moreover, the elements and“units” may be implemented to reproduce one or more CPUs within a deviceor a security multimedia card.

Hereinafter, an embodiment of the disclosure will be described in detailwith reference to the accompanying drawings. In the followingdescription of the disclosure, a detailed description of known functionsor configurations incorporated herein will be omitted when it may makethe subject matter of the disclosure rather unclear. The terms whichwill be described below are terms defined in consideration of thefunctions in the disclosure, and may be different according to users,intentions of the users, or customs. Therefore, the definitions of theterms should be made based on the contents throughout the specification.

Further, the detailed description of embodiments of the disclosure ismade mainly based on a wireless communication system based on OFDM,particularly 3GPP EUTRA standard, but the subject matter of thedisclosure can be applied to other communication systems having asimilar technical background and channel form after a littlemodification without departing from the scope of the disclosure and theabove can be determined by those skilled in the art.

In order to meet wireless data traffic demands, which have increasedsince the commercialization of a 4G communication system, efforts todevelop an improved 5G communication system or a pre-5G communicationsystem have been made. For this reason, the 5G communication system orthe pre-5G communication system is called a beyond-4G-networkcommunication system or a post-LTE system. In order to achieve a highdata transmission rate, implementation of the 5G communication system inan mmWave band (for example, 60 GHz band) is under consideration. In the5G communication system, technologies such as beamforming, massive MIMO,full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming, andlarge-scale antenna technologies are being discussed as means tomitigate propagation path loss in the ultrahigh-frequency band andincrease a propagation transmission distance.

Further, technologies such as an evolved small cell, an advanced smallcell, a cloud Radio Access Network (cloud RAN), an ultra-dense network,device-to-device communication (D2D), a wireless backhaul, a movingnetwork, cooperative communication, coordinated multi-points (CoMP), andinterference cancellation have been developed to improve the systemnetwork in the 5G communication system.

In addition, the 5G system has developed advanced coding modulation(ACM) schemes such as Hybrid FSK and QAM Modulation (FQAM) and slidingwindow superposition coding (SWSC), and advanced access technologiessuch as filter bank multi-carrier (FBMC), non-orthogonal multiple access(NOMA), and sparse code multiple access (SCMA).

Meanwhile, the Internet has evolved from a human-oriented connectionnetwork, in which humans generate and consume information, to theInternet of things (IoT), in which distributed components such asobjects exchange and process information. Internet-of-Everything (IoE)technology, in which big-data processing technology is combined with theIoT technology through a connection with a cloud server or the like, hasemerged. In order to implement IoT, technical factors such as a sensingtechnique, wired, wireless communication, network infrastructure,service-interface technology, and security technology are required, andresearch on technologies such as a sensor network, machine-to-machine(M2M) communication, machine-type communication (MTC), and the like forconnection between objects has recently been conducted. In an IoTenvironment, through collection and analysis of data generated inconnected objects, an Internet technology (IT) service to create newvalue in people's lives may be provided. The IoT may be applied tofields such as those of a smart home, smart building, smart city, smartcar, connected car, smart grid, health care, smart home appliance, orhigh-tech medical service, through the convergence of conventionalinformation technology (IT) and various industries.

Accordingly, various attempts to apply the 5G communication to the IoTnetwork are made. For example, 5G communication technologies such assensor network, M2M communication, and MTC technologies are implementedby beamforming, MIMO, and an array antenna scheme. The application of acloud RAN as the big-data processing technology may be an example ofconvergence of the 5G technology and the IoT technology.

Meanwhile, research on the coexistence of new 5G communication (orcalled NR communication in the disclosure) and LTE communication in thesame spectrum is being conducted for implementation in a mobilecommunication system.

The disclosure relates to a wireless communication system, and moreparticularly to a method and an apparatus by which different wirelesscommunication systems coexist in one carrier frequency or a plurality ofcarrier frequencies and a terminal that can transmit and receive data inat least one of the different communication systems transmits andreceives data to and from each communication system.

In general, a mobile communication system is developed to provide voiceservices while guaranteeing the mobility of users. However, mobilecommunication systems have expanded from voice service to encompass dataservice. In recent years, wireless communication systems have beendeveloped to provide a high-speed data service. However, since resourcesare lacking and users demand higher-speed services in the mobilecommunication system currently providing service, a further improvedmobile communication system is needed.

To meet these demands, standardization of LTE is underway by the3^(rd)-generation partnership project (3GPP) as one of thenext-generation mobile communication systems that are being developed.LTE is a technology of implementing high-speed packet-basedcommunication with a transmission rate of up to about 100 Mbps. To thisend, several methods are under discussion, including a method ofreducing the number of nodes located on a communication channel bysimplifying a network architecture, a method of making wirelessprotocols closest to a wireless channel, and the like.

The LTE system adopts an HARQ scheme of retransmitting correspondingdata on a physical layer when decoding failure occurs upon initialtransmission. In the HARQ scheme, when a receiver does not accuratelydecode data, the receiver transmits information (negativeacknowledgement: NACK) informing the transmitter of decoding failure,and thus the transmitter may re-transmit the corresponding data on thephysical layer.

The receiver combines the data re-transmitted by the transmitter withthe data decoding of which failed, thereby increasing data receptionperformance. When the receiver accurately decodes data, the receivertransmits information (acknowledgement: ACK) informing the transmitterof decoding success and thus the transmitter may transmit new data.

FIG. 1 illustrates the basic structure of a time-frequency region, whichis a radio resource region in which the data or a control channel istransmitted in the downlink of the LTE system.

In FIG. 1, the horizontal axis indicates a time region and the verticalaxis indicates a frequency region. In the time region, the minimumtransmission unit is an OFDM symbol. One slot 106 includes N_(symb) OFDMsymbols 102, and one subframe 105 includes two slots. The length of oneslot is 0.5 ms, and the length of one subframe is 1 ms. A radio frame114 is a time region unit including 10 subframes. The minimumtransmission unit in the frequency region is a subcarrier, and theentire system transmission bandwidth consists of a total of N_(B)wsubcarriers 104.

In the time-frequency region, the basic resource unit is a resourceelement (RE) 112, and an RE is expressed by an OFDM symbol index and asubcarrier index. A resource block (RB) (or physical resource block(PRB) 108 is defined by N_(symb) contiguous OFDM symbols 102 in the timeregion and N_(RB) contiguous subcarriers 110 in the frequency region.Therefore, one RB 108 includes N_(symb)×N_(RB) REs 112. Generally, theminimum transmission unit of data is the RB.

In the LTE system, generally, N_(symb)=7 and N_(RB)=12. N_(BW) isproportional to the bandwidth of the system transmission band. The datarate increases in proportion to the number of RBs scheduled to the UE.The LTE system defines and operates 6 transmission bandwidths. In thecase of an FDD system, in which the downlink and the uplink are dividedaccording to frequency, a downlink transmission bandwidth and an uplinktransmission bandwidth may be different from each other. The channelbandwidth may be an RF bandwidth, that is, a system transmissionbandwidth.

[Table 1] indicates the relationship between a system transmissionbandwidth and a channel bandwidth defined in the LTE system. Forexample, when LTE system has a channel bandwidth of 10 MHz, thetransmission bandwidth may include 50 RBs.

TABLE 1 Channel 1.4 3 5 10 15 20 bandwidth BW_(channel)[MHz]Transmission 6 15 25 50 75 100 bandwidth configuration

Downlink control information is transmitted within initial N OFDMsymbols in the subframe, Generally, N={1, 2, 3}. Accordingly, N ischanged in every subframe depending 21) on the amount of controlinformation to be transmitted through the current subframe. A controlchannel transmission interval indicator indicating how many OFDM symbolsare used to transmit the control information, scheduling information ofdownlink data or uplink data, and an HARQ ACK/NACK signal may beincluded in the control information.

In the LTE system, scheduling information of downlink data or uplinkdata is transmitted from the base station to the UE through DCI. Theuplink (UL) is a radio link through which the UE transmits data orcontrol signals to the BS, and the downlink (DL) is a radio link throughwhich the BS transmits data or control signals to the UE.

The DCI are defined in various formats. A DCI format may be determinedand applied for operation based on whether scheduling information is foruplink data (UP grant) or for downlink data (DL grant), whether it iscompact DCI of which the control information is small, whether spatialmultiplexing using multiple antennas is applied, whether it is used forcontrolling power, and the like.

For example, DCI format 1, corresponding to scheduling controlinformation for downlink data (DL grant), may be configured to includeat least the following control information

-   -   Resource allocation type 0/1 flag: indicates whether a resource        allocation type is type 0 or type 1. Type 0 is a type of        allocating resources in units of a resource block group (RBG) by        applying a bitmap scheme. In the LTE system, the basic        scheduling unit is a resource block (RB), expressed by time and        frequency region resources, and an RBG includes a plurality of        RBs and is used as a basic scheduling unit in type 0. Type 1 is        a type of allocating a particular RB within the RBG    -   Resource block assignment: indicates RBs allocated to data        transmission. The expressed resources are determined according        to the system bandwidth and resource allocation scheme    -   Modulation and coding scheme (MCS): indicates the modulation        scheme used for data transmission and the size of the transport        block, that is, the data to be transmitted    -   HARQ process number: indicates the process number of HARQ    -   New data indicator (NDI): indicates initial HARQ transmission or        HARQ retransmission.    -   Redundancy version (RV): indicates the redundancy version of        HARQ.    -   Transmit power control (TPC) command for PUCCH: indicates a        transmission power control command for a PUCCH, which is an        uplink control channel.

The DCI is transmitted through a PDCCH or an enhanced PDCCH (EPDCCH),which is a downlink physical control channel, via a channel-coding andmodulation process.

In general, the DCI is channel-coded independently for each UE, and isthen configured and transmitted as an independent PDCCH. In the timeregion, the PDCCH is mapped and transmitted during the control channeltransmission interval. The frequency region mapping position of a PDCCHis determined by the identifier (ID) of each UE, and is propagated tothe entire system transmission band.

Downlink data is transmitted through a PDSCH, which is a physicalchannel for downlink data transmission. The PDSCH is transmitted afterthe control channel transmission interval, and the detailed mappinglocation in the frequency region and scheduling information such as themodulation scheme are indicated through DCI transmitted through thePDCCH.

Via an MCS formed of 5 bits in the control information included in theDCI, the BS may report the modulation scheme applied to a PDSCH to betransmitted to the UE and the size (transport block size (TBS)) of datato be transmitted. The TBS corresponds to the size before channel codingfor error correction is applied to the data (TB) to be transmitted bythe BS.

The modulation schemes supported by the LTE system include quadraturephase shift keying (QPSK), 16 quadrature amplitude modulation (16QAM),and 64QAM. Modulation orders (Qm) thereof correspond to 2, 4, and 6,respectively. That is, in the case of QPSK modulation, 2 bits may betransmitted per symbol. In the case of 16QAM modulation, 4 bits may betransmitted per symbol. In the case of 64QAM modulation, 6 bits may betransmitted per symbol.

Unlike LTE Rel-8, 3GPP LTE Rel-10 has adopted a bandwidth extensiontechnology in order to support a larger amount of data transmission. Thetechnology called bandwidth extension or carrier aggregation (CA) mayexpand the bandwidth and thus increase the amount of data capable ofbeing transmitted using the expanded band compared to the LTE Rel-8 UE,which transmits data in one band.

Each of the bands is called a component carrier (CC), and LTE Rel-8 UEis defined to have one component carrier for each of the downlink andthe uplink. Further, a group of uplink component carriers connected todownlink component carriers through SIB-2 is called a cell. The SIB-2connection relation between the downlink component carriers and theuplink component carriers is transmitted through a system signal or ahigher signal. The UE supporting CA may receive downlink data through aplurality of serving cells and transmit uplink data.

When the BS has difficulty in transmitting the PDCCH to a specific UE ina specific serving cell in Rel-10, the BS may transmit the PDCCH inanother serving cell and configure a carrier indication field (CIF) as afield indicating that the corresponding PDCCH indicates a PDSCH or aPUSCH of the other serving cell.

The CIF may be configured in the UE supporting CA. The CIF is determinedto indicate another serving cell by adding 3 bits to the PDCCH in aparticular serving cell, and the CIF is included only when cross-carrierscheduling is performed, and if CIF is not included, cross-carrierscheduling is not performed. When the CIF is included in downlinkallocation information (DL assignment), the CIF is defined to indicate aserving cell to which a PDSCH scheduled by the DL assignment istransmitted. When the CIF is included in uplink resource allocationinformation (UL grant), the CIF is defined to indicate a serving cell towhich a PUSCH scheduled by the UL grant is transmitted.

As described above, in LTE-10, carrier aggregation (CA), which istechnology for bandwidth expansion, may be defined, and a plurality ofserving cells may be configured in the UE. The UE periodically oraperiodically transmits channel information of the plurality of servingcells to the BS for data scheduling of the BS. The BS schedules andtransmits data for each carrier, and the UE transmits AN feedback ofdata transmitted for each carrier.

LTE Rel-10 is designed to transmit AN feedback, which is a maximum of 21bits, and is further designed to transmit the AN feedback and discardthe channel information when transmission of AN feedback andtransmission of channel information overlap each other in one subframe.

LTE Rel-11 is designed to multiplex AN feedback and channel informationof one cell and transmit the AN feedback corresponding to a maximum of22 bits and the channel information of one cell in transmissionresources of PUCCH format 3 through PUCCH format 3.

A scenario in which a maximum of 32 serving cells are configured isassumed in LTE-13, and the concept of expanding the number of servingcells up to a maximum of 32 serving cells has been constructed using notonly a licensed band but also an unlicensed band. Further, in LTE-13,LTE service has been provided in an unlicensed band, such as a band of 5GHz due to the limitation on the number of licensed bands, such as theLTE frequency, which is called licensed assisted access (LAA).

Carrier aggregation technology of LTE is applied to LAA, and an LTEcell, which is a licensed band supports operation of an LAA cellcorresponding to an unlicensed band as an S cell. Accordingly, as inLTE, feedback generated in the LAA cell corresponding to the S cellshould be transmitted only in a P cell, and the LAA cell may freelyapply a downlink subframe and an uplink subframe. Unless speciallymentioned in this specification, “LTE” refers to all technologiesevolved from LTE, such as LTE-A and LAA.

Meanwhile, as a post-LTE communication system, a 5^(th)-generationwireless cellular communication system (hereinafter, referred to as “5G”or “NR” in the specification) should freely reflect the variousrequirements of users and service providers, so that services that meetvarious requirements may be supported.

Accordingly, 5G may define various 5G services such as enhanced mobilebroadband communication (hereinafter, referred to as eMBB in thisspecification), massive machine-type communication (hereinafter,referred to as mMTC in this specification), and ultra-reliable andlow-latency communications (hereinafter, referred to as URLLC in thisspecification) by the technology for satisfying requirements selectedfor 5G services, among requirements of a maximum UE transmission rate of20 Gbps, a maximum UE speed of 500 km/h, a maximum delay time of 0.5 ms,and a UE access density of 1,000,000 UEs/km².

For example, in order to provide eMBB in 5G, a maximum downlink UEtransmission rate of 20 Gbps and a maximum uplink UE transmission rateof 10 Gbps should be provided from the viewpoint of one BS. Also, theaverage transmission rate that the UE actually experiences should beincreased. In order to satisfy these requirements, improvement oftransmission/reception technologies, including a further improvedmulti-input multi-output transmission technology, is needed.

Also, in order to support an application service such as IoT, theimplementation of mMTC is under consideration in 5G. The mMTC hasrequirements of supporting access of massive numbers of terminals withina cell, improving coverage of the terminal, increasing effective batterylifetime, and reducing the costs of the terminal in order to efficientlysupport IoT. IoT connects various sensors and devices to provide acommunication function, and thus should support a large number ofterminals within the cell (for example, 1,000,000 UEs/km²). Further, inthe mMTC, the UE is highly likely to be located in a shade area such asthe basement of a building or an area that cannot be covered by the celldue to characteristics of the service, and thus mMTC requires widercoverage than the coverage provided by eMBB. The mMTC is highly likelyto be configured by cheap UEs, and it is difficult to frequently changea battery of such a UE, so a long battery life time is needed.

Last, the URLLC is cellular-based wireless communication used for aparticular purpose and corresponds to a service used for remote controlof a robot or a machine device, industrial automation, unmanned aerialvehicles, remote health control, and emergency notification, and thusshould provide ultra-low-latency and ultra-reliable communication. Forexample, the URLLC should have a maximum delay time shorter than 0.5 msand is also required to provide a packet error rate equal to or lowerthan 10⁻⁵. Therefore, for the URLLC, a transmission time interval (TTI)smaller than that of the 5G service such as the eMBB should be provided,and additionally, it is required to design allocation of wide resourcesin a frequency band.

The services under consideration in the 5^(th)-generation wirelesscellular communication system should be provided as a single framework.That is, in order to efficiently manage and control resources, it ispreferable to perform control and transmission such that the servicesare integrated into one system rather than to independently operate theservices.

FIG. 2 illustrates an example in which services under consideration by5G are transmitted to one system.

Referring to FIG. 2, frequency-time resources 201 used by 5G may includea frequency axis 202 and a time axis 1 b-03. FIG. 2 illustrates anexample in which eMBB 205, mMTC 206, and URLLC 207 are operated withinone framework. Further, as a service that can be additionally consideredfor implementation in 5G, an enhanced mobile broadcast/multicast service(eMBMS) 1 b-08 for providing a cellular-based broadcast service may beconsidered.

The services under consideration for 5G, such as the eMBB 205, the mMTC206, the URLLC 207, and the eMBMS 208, may be multiplexed throughtime-division multiplexing (TDM) or frequency-division multiplexing(FDM) within one system frequency bandwidth used by 5G, andspatial-division multiplexing may also be considered.

In the case of the eMBB 205, it is preferable to occupy and transmitfrequency bandwidths as many as possible for a particular time in orderto provide the increased data transmission rate. Accordingly, it ispreferable that the service of the eMBB 2-05 betime-division-multiplexed with another service within the systemtransmission bandwidth 201, but it is also preferable that the serviceof the eMBB be frequency-division-multiplexed with other services withinthe system transmission bandwidth depending on the need of the otherservices.

Unlike other services, the mMTC 206 requires an increased transmissioninterval in order to secure wider coverage, and may secure the coverageby repeatedly transmitting the same packet within the transmissioninterval. In order to simultaneously reduce terminal complexity andterminal price, the transmission bandwidth within which the terminal canperform reception is limited. As described above, when the requirementsare considered, it is preferable that the mMTC 206 be frequency-divisionmultiplexed with other services within the transmission system bandwidth201.

It is preferable that the URLLC 207 have a shorter transmission timeinterval (TTI) compared to other services in order to meet theultra-low-latency requirement of the service. Also, in order to meet theultra-reliable requirement, a low coding rate is needed, so that it ispreferable to have a wide bandwidth from the aspect of frequency. Whenthe requirements of the URLLC 207 are considered, it is preferable thatthe URLLC 207 be time-division multiplexed with other services withinthe transmission system bandwidth 201 of 5G.

The aforementioned services may have different transmission/receptionschemes and transmission/reception parameters in order to meet therequirements of the services. For example, the services may havedifferent numerologies depending on the requirements thereof. Thenumerology includes a cyclic prefix (CP) length, subcarrier spacing, anOFDM symbol length, and a transmission time interval (TTI) in anorthogonal frequency-division multiplexing (OFDM) or an orthogonalfrequency division multiple access (OFDMA)-based communication system.In an example in which the services have different numerologies, theeMBMS 208 may have a longer CP than other services. Since the eMBMStransmits higher traffic based on broadcasting, the same data may betransmitted in all cells. At this time, if the signals received by aplurality of cells reach the CP length, the UE may receive and decodeall of the signals and thus obtain a single frequency network (SFN)diversity gain, and accordingly, even a UE located at a cell boundarycan receive broadcasting information without any coverage restriction.

However, when the CP length is relatively longer than other services,waste occurs due to CP overhead in order to support the eMBMS, and thusa longer OFDM symbol is required compared to other services, whichresults in narrower subcarrier spacing compared to other services.

Further, as an example in which different numerologies are used forservices in 5G, a shorter OFDM symbol may be required as a shorter TTIis needed compared to other services, and moreover, wider subcarrierspacing may be required in the case of URLLC.

Meanwhile, one TTI may be defined as one slot and may consist of 14 OFDMsymbols or 7 OFDM symbols in 5G. Accordingly, in the case of subcarrierspacing of 15 kHz, one slot has a length of 1 ins or 0.5 ms.

In 5G, one TTI may be defined as one mini-slot or sub-slot for emergencytransmission and transmission in an unlicensed band, and one mini-slotmay have OFDM symbols ranging from 1 to the number of OFDM symbols ofthe slot—1. If the length of one slot corresponds to 14 OFDM symbols,the length of the mini-slot may be determined as one of 1 to 13 OFDMsymbols. The length of the slot or the mini-slot may be definedaccording to a standard, or may be transmitted by a higher signal orsystem information and received by the UE.

The slot or the mini-slot may be defined to have various transmissionformats, and may be classified into the following formats.

-   -   DL-only slot or full-DL slot: includes only a downlink period        and supports only downlink transmission.    -   DL-centric slot: includes a downlink period, a guard period        (GP), and an uplink period, wherein the number of OFDM symbols        in the downlink period is larger than the number of OFDM symbols        in the uplink period.    -   UL-centric slot: includes a downlink period, a guard period        (GP), and an uplink period, wherein the number of OFDM symbols        in the downlink period is smaller than the number of OFDM        symbols in the uplink period.    -   UL-only slot or full-UL slot: includes only an uplink period and        supports only uplink transmission.

Only the slot formats have been classified, but the mini-slot may alsobe classified through the same classification scheme. That is, themini-slot may be classified into a DL-only mini-slot, a DL-centricmini-slot, a UL-centric mini-slot, and a UL-only mini-slot.

The transmission interval (or a transmission start symbol and endsymbol) of the uplink control channel may vary depending on the formatof the slot or the mini-slot. Further, the case in which an uplinkcontrol channel having a short transmission interval (hereinafter,referred to as a short PUCCH in the disclosure) to minimize atransmission delay and an uplink control channel having a longtransmission interval (hereinafter, referred to as a long PUCCH in thedisclosure) to obtain sufficient cell coverage coexist in one slot or aplurality of slots and the case in which the uplink control channel ismultiplexed in one slot or a plurality of slots while an uplink soundingsignal such as an SRS is transmitted should be considered. Accordingly,when the UE is configured to transmit the uplink control channel, ascheme for maximizing the use of time-frequency resources of the BS andpreventing a collision of transmission resources of the uplink controlchannel is needed. The disclosure provides a method by which an intervalof the uplink control channel (or a start symbol and an end symbol) isindicated to the UE for transmission and reception of the uplink controlchannel in the slot or the mini-slot by the BS and the UE and the UEreceives the values and transmits the uplink control channel in the slotor the mini-slot.

Hereinafter, exemplary embodiments of the disclosure will be describedin detail with reference to the accompanying drawings. Here, it is notedthat identical reference numerals denote the same structural elements inthe accompanying drawings. Further, a detailed description of a knownfunction and configuration which may make the subject matter of thedisclosure unclear will be omitted.

In addition, although the following detailed description of embodimentsof the disclosure will be directed to LTE and 5G, it can be understoodby those skilled in the art that the main gist of the disclosure mayalso be applied to other communication systems having similar technicalbackgrounds and channel formats, with slight modification, withoutsubstantially departing from the scope of the disclosure.

Hereinafter, a 5G system for transmitting and receiving data in the 5Gcell will be described.

FIG. 3 illustrates an embodiment of a communication system to which thedisclosure is applied.

The drawings illustrate the form in which the 5G system is operated, andthe schemes proposed by the disclosure can be applied to the system ofFIG. 3.

Referring to FIG. 3, the case in which a 5G cell 302 is operated by oneBS 301 in a network is shown. A UE 303 is a 5G-capable UE having a 5Gtransmission/reception module. The UE 303 obtains synchronizationthrough a synchronization signal transmitted in the 5G cell 302,receives system information, and then transmits and receives data to andfrom the BS 301 through the 5G cell 302. In this case, there is nolimitation as to the duplexing method of the 5G cell 302. If the 5G cellis a P cell, uplink control transmission is performed through the 5Gcell 302. In the 50 system, the 5G cell may have a plurality of servingcells and support a total of 32 serving cells. It is assumed that the BS301 includes a 5G transmission/reception module (system) in the networkand can manage and operate the 50 system in real time.

Subsequently, a procedure in which the BS configures 5G resources andtransmits and receives data to and from the 5G-capable UE 303 inresources for 5G will be described.

In step 311, the BS 301 transmits synchronization for 50, systeminformation, and higher configuration information to the 5G-capable UE 1c-03. With respect to the synchronization signal for 5G, separatesynchronization signals may be transmitted for eMBB, mMTC, and URCCLusing different numerologies, and a common synchronization signal may betransmitted through specific 5G resources using one numerology. Withrespect to the system information, common system information may betransmitted through specific 50 resources using one numerology, andseparate system information may be transmitted for eMBB, mMTC, and URLLCusing different numerologies. The system information and the higherconfiguration information may include configuration informationindicating whether to use the slot or the mini-slot for datatransmission and reception, the number of OFDM symbols of the slot orthe mini-slot, and the numerology therefor. Further, when reception of adownlink common control channel is configured in the UE, the systeminformation and the higher configuration information may includeconfiguration information related to reception of the downlink commoncontrol channel.

In step 312, the BS 301 transmits and receives data for the 5G serviceto and from the 5G-capable UE 303 through 5G resources.

Subsequently, the procedure in which the 5G-capable UE 303 receives theconfiguration of 50 resources from the BS 301 and transmits and receivesdata through the 50 resources will be described.

In step 321, the 5G-capable UE 303 obtains synchronization from thesynchronization signal for 5G transmitted by the BS 301 and receives thesystem information and the higher configuration information transmittedby the BS 301. With respect to the synchronization signal for 5G,separate synchronization signals may be transmitted for eMBB, mMTC, andURCCL using different numerologies, and a common synchronization signalmay be transmitted through specific 5G resources using one numerology.With respect to the system information, common system information may betransmitted through specific 50 resources using one numerology, andseparate system information may be transmitted for eMBB, mMTC, and URLLCusing different numerologies. The system information and the higherconfiguration information may include configuration informationindicating whether to use the slot or the mini-slot for datatransmission and reception, the number of OFDM symbols of the slot orthe mini-slot, and the numerology therefor. Further, when reception of adownlink common control channel is configured in the UE, the systeminformation and the higher configuration information may includeconfiguration information related to the reception of the downlinkcommon control channel.

In step 322, the 5G-capable UE 303 transmits and receives data for the5G service to and from the BS 301 through 5G resources.

Described below is a method of transmitting a long PUCCH on the basis ofa scheme for indicating a transmission interval (or a start system andan end symbol) of the long PUCCH in order to prevent resource collisionsand maximize the use of resources if uplink control channels such as thelong PUCCH, a short PUCCH, and an SRS coexist within one TTI or one slotin the situation in which the 5G system of FIG. 3 is operated by theslot or the mini-slot.

First, FIG. 4 illustrates embodiment 1-1 of the disclosure.

FIG. 4 illustrates a method by which the UE determines the transmissioninterval (or the start symbol and the end symbol) of the long PUCCH onthe basis of the slot and transmits an uplink control channel, but itshould be noted that FIG. 4 may be applied to the case in which the UEdetermines the transmission interval (or the start symbol and the endsymbol) of the long PUCCH on the basis of the mini-slot and transmitsthe uplink control channel.

FIG. 4 shows FDM 400 in the frequency region and TDM 401 in the timeregion of the long PUCCH and the short PUCCH. First, the structure ofthe slot in which the long PUCCH and the short PUCCH are multiplexedwill be described with reference to FIG. 4.

Reference numerals 420 and 421 indicate UL-centric slots in which uplinkis mainly used in the slot (various names such as subframe ortransmission time interval (TTI) may be used, but a slot which is abasic transmission unit is used in the disclosure) which is a basictransmission unit of 5G.

In the UL-centric slot, most OFDM symbols are used for uplink, and allOFDM symbols may be used for uplink transmission, or some front OFDMsymbols may be used for downlink transmission. If both the downlink andthe uplink exist in one slot, there may be a transmission gaptherebetween.

In FIG. 4, a first OFDM symbol may be used for downlink transmission,for example, downlink control channel transmission 402, and symbols froma third OFDM symbol may be used for uplink transmission. A second OFDMsymbol is used for the transmission gap. In uplink transmission, uplinkdata channel transmission and uplink control channel transmission can beperformed.

Subsequently, a long PUCCH 403 will be described. A control channel of along transmission interval is used to increase cell coverage, and thusmay be transmitted through a DFT-S-OFDM scheme for short carriertransmission rather than OFDM transmission.

Accordingly, the transmission should be performed using only successivesubcarriers, and uplink control channels of a long transmission intervalare configured so as to be spaced apart from each other, as indicated byreference numerals 408 and 409, in order to obtain a frequency diversityeffect. A separation distance on the frequency side should be smallerthan the bandwidth supported by the UE, and the long PUCCH may betransmitted using PRB-1 408 in the front part of the slot and usingPRB-2 409 in the back part of the slot. The PRB is a physical resourceblock, which is a minimum transmission unit on the frequency side, andmay be defined as 12 subcarriers. Accordingly, a frequency distancebetween PRB-1 and PRB-2 should be smaller than a maximum supportbandwidth of the UE, and the maximum support bandwidth of the UE may beequal to or smaller than the bandwidth 406 supported by the system.Frequency resources PRB-1 and PRB-2 may be configured for the UE througha higher signal, frequency resources may be mapped to a bit field by ahigher signal, and information indicating which frequency resources areused may be indicated to the UE through a bit field included in adownlink control channel.

Each of the control channel transmitted in the front part of the slot408 and the control channel transmitted in the back part of the slot 409may include uplink control information (UCI) 410 and a UE referencesignal 411, and it is assumed that the two signals are transmitted indifferent OFDM symbols in a time-division manner.

Subsequently, a short PUCCH 418 will be described. The short PUCCH maybe transmitted through both the DL-centric slot and the UL-centric slotand may generally be transmitted through the last symbol of the slot oran OFDM symbol in the back (for example, the last OFDM symbol, thesecond-to-last OFDM symbol, or the last two OFDM symbols). Of course,the short PUCCH can be transmitted at a random location within the slot.The short PUCCH may be transmitted using one OFDM symbol or a pluralityof OFDM symbols.

In FIG. 4, the short PUCCH is transmitted in the last symbol 418 of theslot. Radio resources for the short PUCCH may be allocated in units ofOPRBs from the aspect of frequency, and a plurality of successive PRBsmay be allocated, or a plurality of PRBs separated from each other inthe frequency band may be allocated. The allocated PRBs should beincluded in a band equal to or smaller than the frequency band 407supported by the UE. The plurality of PRBs which are the allocatedfrequency resources may be configured in the UE by a higher signal, thefrequency resources may be mapped to a bit field by the higher signal,and the frequency resources to be used may be indicated to the UE by thebit field included in the downlink control channel. Uplink controlinformation 420 and a demodulation reference signal 421 should bemultiplexed within one PRB in the frequency band, and there may be amethod of transmitting a demodulation reference signal to one subcarrierfor every two symbols, as indicated by reference numeral 412, a methodof transmitting a demodulation reference signal to one subcarrier forevery three symbols, as indicated by reference numeral 413, or a methodof transmitting a demodulation reference signal to one subcarrier forevery four symbols, as indicated by reference numeral 414.

Next, multiplexing of the long PUCCH and the short PUCCH will bedescribed below. In one slot 420, long PDCCHs and short PDCCHs ofdifferent UEs may be multiplexed in the frequency region, as indicatedby reference numeral 400. At this time, the BS may configure frequencyresources of the short PUCCH and the long PUCCH of different UEs so asto avoid overlapping each other, like the PRBs of FIG. 4. However,configuring transmission resources of the uplink control channel of allUEs differently wastes frequency resources regardless of whetherscheduling is performed, and is inappropriate when it is considered thatthe limited frequency resources should be used for uplink data channeltransmission rather than uplink control channel transmission.Accordingly, frequency resources of the short PUCCHs and the long PUCCHsof different UEs may overlap each other, in which case the BS isrequired to perform scheduling and use transmission resources ofdifferent UEs so as to avoid collisions in one slot.

However, if collisions between short PUCCH transmission resources andlong PUCCH transmission resources of different UDs in a specific slotcannot be avoided, the BS needs a method of preventing collisionsbetween short PUCCH transmission resources and long PUCCH transmissionresources, and the UE needs a method of controlling long PUCCHtransmission resources according to the indication of the BS. The shortPUCCH and long PUCCH transmission resources may be multiplexed in thetime region within one slot 421 through the method indicated byreference numeral 401.

The disclosure provides a method of avoiding the transmission resourcecollision between transmission of the uplink control channel in theshort time region such as the short PUCCH or the SRS and transmission ofthe uplink control channel in the long time region such as the longPUCCH.

The method of the disclosure may broadly include two methods. In thefirst method, in order to avoid a collision between transmissionresources of the long PUCCH and transmission resources of the uplinkcontrol channel in the short time region in one slot, the BS maydirectly indicate the transmission resources of the long PUCCH in oneslot to the UE through a first signal, and the UE may performtransmission of the long PUCCH in the transmission resources indicatedin one slot through the reception of the first signal.

The first signal may contain a higher signal, a physical signal, or acombination of a higher signal and a physical signal, and may include anOFDM symbol interval (or a start OFDM symbol and an end OFDM symbol) inthe time region for transmission of the long PUCCH and PRBs in thefrequency region.

In the second method, the BS direct/indirectly indicates transmissionresources of the long PUCCH in one slot to the UE in advance through afirst signal or definition in the standard for correlating transmissionresources of the long PUCCH from the number of uplink/downlink OFDMsymbols and the number of GP OFDM symbols of the slot, and reduces orcontrols the transmission resources of the long PUCCH, indicated inadvance through a second signal, in order to avoid a collision withtransmission resources of the uplink control channel in a short timeregion. The UE determines in advance a transmission interval of the longPUCCH from the reception of the first signal or the number ofuplink/downlink OFDM symbols and the number of GP OFDM symbols of theslot and controls transmission resources of the long PUCCH in one slotthrough reception of the second signal to perform transmission of thelong PUCCH in one slot.

The first signal and the second signal may contain a higher signal, aphysical signal, or a combination of a higher signal and a physicalsignal. The first signal includes an OFDM symbol interval (or a startOFDM symbol and an end OFDM symbol) in the time region for transmissionof the long PUCCH and PRBs in the frequency region, and the secondsignal includes an OFDM symbol interval (or a start OFDM symbol and anend OFDM symbol) in the time region in which transmission of the longPUCCH cannot be performed in one slot and PRBs in the frequency region.

The first method is suitable for uplink control channel transmission,such as periodic channel information transmission configured to the UEfor period transmission without a scheduling grant, and the secondmethod is suitable for uplink control channel transmission such asHARQ-ACK transmission configured to the UE for aperiodic transmissionwith a scheduling grant. Accordingly, it is determined whether to applythe first method or the second method depending on whether the uplinkcontrol channel transmitted by the UE is triggered by the schedulinggrant or the transmitted uplink control information is periodic channelinformation or HARQ-ACK. That is, the first method may be applied totransmission of the uplink control channel configured to be transmittedby the UE without a scheduling grant, and the second method may beapplied to the uplink control channel if transmission of the uplinkcontrol channel is triggered by the scheduling grant by the UE.

Alternatively, the UE may apply the first method to uplink controlchannel transmission corresponding to period channel informationtransmission and apply the second method to the uplink control channelfor transmitting HARQ-ACK information.

Alternatively, the BS may configure the UE to always apply the firstmethod or the second method through a higher signal. If the UE receivesconfiguration information that indicates that the first method is alwaysapplied to the uplink control channel through a higher signal, the UEalways applies the first method to transmit the uplink control channel.If the UE receives configuration information that indicates that thesecond method is always applied to the uplink control channel through ahigher signal, the UE always applies the second method to transmit theuplink control channel.

A detailed description of the first method and the second method will begiven below.

-   -   In the first method, the BS indicates an OFDM symbol interval        (or a start OFDM symbol and an end OFDM symbol or OFDM symbols        in which transmission of the long PUCCH should be avoided) for        transmission of the long PUCCH in the downlink control channel        to the UE. The downlink control channel may be common        information to group UEs or all UEs within the cell, or may be        dedicated information transmitted only to a specific UE. If long        PUCCH transmission frequency resources of the UE overlap short        PUCCH transmission frequency resources of another UE in the last        OFDM symbol of the slot, the BS may prevent the long PUCCH        transmission interval from being the last OFDM symbol.

For example, if the long PUCCH transmission interval supports OFDMsymbols ranging from 4 OFDM symbols to 12 OFDM symbols (the uplinkinterval of the UL-centric slot 420 is 12 OFDM symbols), the BSindicates long PUCCH transmission in 11 OFDM symbols instead of longPUCCH transmission in 12 OFDM symbol through a bit field of the downlinkcontrol channel, and the UE transmits the long PUCCH in the 11 OFDMsymbols. In another example, the long PUCCH transmission interval isconfigured as a set including at least one value of the limited symbolinterval through a higher signal or defined according to a standard, forexample, if transmission is performed only in 4, 6, 8, 10, and 12 OFDMsymbols through a higher signal or defined according to the standard,the BS indicates long PUCCH transmission in 10 OFDM symbols through abit field of the downlink control channel, and the UE transmits the longPUCCH in 10 OFDM symbols in order to avoid a collision with short PUCCHtransmission resources in the last OFDM symbol.

Alternatively, the BS may indicate the interval for short PUCCHtransmission (or whether the interval is the last OFDM symbol, thesecond-last OFDM symbol, or the last two OFDM symbols), thereby avoidinga resource collision with the long PUCCH.

-   -   In the second method, the BS configures an OFDM symbol interval        (or a start OFDM symbol and an end OFDM symbol or OFDM symbols        in which transmission of the long PUCCH should be avoided) for        long PUCCH transmission to the UE through a higher signal. Short        PUCCH transmission frequency resources may be configured to have        distributed PRBs or localized PRBs. If short PUCCH transmission        frequency resources have distributed PRBs, there is a high        probability of a collision with short PUCCH transmission        frequency resources, so the BS may prevent the long PUCCH        transmission OFDM symbol interval from being OFDM symbols in        which the short PUCCH is transmitted through a higher signal,        that is, the last OFDM symbol. For example, the BS configures        the long PUCCH transmission interval as 10 OFDM symbols to the        UE through a higher signal, and the UE performs long PUCCH        transmission in 10 OFDM symbols.    -   In the third method, the BS configures whether to perform long        PUCCH transmission or short PUCCH transmission to the UE through        a higher signal or a physical downlink control signal and        correlates the OFDM symbol interval for long POUCCH transmission        with the number of uplink OFDM symbols according to a slot        format. However, information on whether long PUCCH transmission        can be performed in the last one or two OFDM symbols is        indicated to the UE. The UE may receive the configuration        information and determine whether to transmit the long PUCCH or        the short PUCCH. If the UE receives indication information and        performs long PUCCH transmission, the UE determines whether long        PUCCH transmission can be performed in the last one or two OFDM        symbols. That is, if it is assumed that the uplink OFDM symbol        interval is 11 OFDM symbols, the UE may determine that long        PUCCH transmission is performed in 11 OFDM symbols on the basis        of the uplink OFDM symbol interval of the slot, and may receive        the indication information to determine whether to perform long        PUCCH transmission in 11 OFDM symbols, 10 OFDM symbols, or 9        OFDM symbols. If the long PUCCH is transmitted in 10 OFDM symbol        or 9 OFDM symbols, the long PUCCH symbols may be punctured or        rate-matched from the back on the basis of the long PUCCH        transmission in 11 OFDM symbols. Information on the uplink OFDM        symbol interval of the slot may be received by the UE from the        downlink control channel, and the downlink control channel may        be common information to group UEs or all UEs in the cell, or        may be dedicated information transmitted to specific UEs.

FIGS. 5A and 5B illustrate BS and UE procedures according to embodiment1-1 of the disclosure.

First, the BS procedure will be described.

In step 511, the BS transmits uplink control channel configurationinformation to the UE. The uplink control channel configurationinformation may include frequency PRB resources of the long PUCCH or theshort PUCCH or an available set including at least one value of the timeOFDM symbol interval, as described in connection with FIG. 4, and the BSmay transmit the information to the UE through a higher signal in orderto avoid a short PUCCH or long PUCCH transmission resource collisionbetween UEs.

In step 512, the BS transmits a downlink control channel to the UE. Thedownlink control channel may include a bit field indicating frequencyPRBs of the short PUCCH or the long PUCCH, the time OFDM symbolinterval, the start OFDM symbol and the end OFDM symbol, or an OFDMsymbol through which the long PUCCH transmission should be avoided, asdescribed in connection with FIG. 4, and the BS may transmit theinformation to the UE in order to avoid a short PUCCH or long PUCCHtransmission resource collision between UEs. The downlink controlchannel may be common information to group UEs or all UEs within thecell, or may be dedicated information transmitted only to a specific UE.

In step 513, the BS receives an uplink control channel from the UE atthe short PUCCH or long PUCCH transmission time through frequencyresources indicated in step 511 or 512.

Next, the UE procedure will be described.

In step 521, the UE receives uplink control channel configurationinformation from the BS. The uplink control channel configurationinformation may include frequency PRB resources of the long PUCCH or theshort PUCCH or an available set including at least one value of the timeOFDM symbol interval, and the UE may receive the information from the BSthrough a higher signal in order to avoid a short PUCCH or long PUCCHtransmission resource collision between UEs.

In step 522, the UE receives a downlink control channel from the BS. Thedownlink control channel may include a bit field indicating frequencyPRBs of the short PUCCH or the long PUCCH, the time OFDM symbolinterval, the start OFDM symbol and the end OFDM symbol, or an OFDMsymbol through which the long PUCCH transmission should be avoided, asdescribed in connection with FIG. 4, and the UE may receive theinformation from the BS in order to avoid short PUCCH or long PUCCHtransmission resource collision between UEs. The downlink controlchannel may be common information to group UEs or all UEs within thecell, or may be dedicated information transmitted only to a specific UE.

In step 523, the UE transmits an uplink control channel to the BS at ashort PUCCH or long PUCCH transmission time through the frequencyresources indicated in step 521 or 522.

FIG. 6 illustrates embodiment 1-2 according to the disclosure.

FIG. 6 illustrates a method by which the UE receives an OFDM symbolinterval (or a start OFDM symbol location and an end OFDM symbollocation or an OFDM symbol through iii which the long PUCCH is nottransmitted) of the long PUCCH of the uplink control channel on thebasis of the slot and transmits an uplink control channel, but may beapplied to the case in which the UE receives an OFDM symbol interval (ora start OFDM symbol location and an end OFDM symbol location or an OFDMsymbol through which the long PUCCH is not transmitted) of the longPUCCH of the uplink control channel on the basis of the mini-slot andtransmits an uplink control channel.

There is a difference between FIG. 4 and FIG. 6 in that FIG. 4 considersthe case in which uplink control channels, such as the long PUCCH andthe short PUCCH or SRSs, collide within one slot, but FIG. 6 provides amethod of avoiding a collision between transmission resources of thelong PUCCH and transmission resources of the short PUCCH or the SRStransmitted through a plurality of slots when the long PUCCH istransmitted through the plurality of slots, that is, when slotaggregation is configured in the UE by a higher signal or indicated tothe UE through an L1 signal.

As described above, 5G supports various slot formats, that is, aDL-dedicated slot, a DL-centric slot, a UL-dedicated slot, and aUL-centric slot. In each slot format, a downlink period, a GP, and anuplink period may be configured by various OFDM symbols. The slot formatand the format structure (the number of OFDM symbols of the downlinkperiod, the GP, and the uplink period) may be received by the UE througha higher signal or an L1 signal.

In order to improve coverage of the UE, slot aggregation may beconfigured in the UE through a higher signal, or may be indicated by anL2 signal. The UE in which slot aggregation is configured or for whichslot aggregation is indicated and which is configured or indicated totransmit the long PUCCH transmits the long PUCCH through a plurality ofslots. The number of slots for which slot aggregation is performed maybe configured in or indicated to the UE by a higher signal or an L1signal.

Like the slot format illustrated in FIG. 6, the plurality of slots mayhave various slot formats. If the UE is configured or indicated toperform slot aggregation through four slots, the number of uplink OFDMsymbols through which the long PUCCH can be transmitted may varydepending on the slot format or the slot structure. It is assumed thatslot # n is a UL-dedicated slot in which the long PUCCH can betransmitted through 14 OFDM symbols, slot # (n+1) is a UL-centric slotin which the long PUCCH can be transmitted through 12 OFDM symbols, andslot # (n+2) is a UL-centric slot in which the long PUCCH can betransmitted through 11 OFDM symbols, but transmission resources of theshort PUCCH collide with transmission resources of the long PUCCH in thelast symbol, and thus the long PUCCH can be actually transmitted through10 OFDM symbols in FIG. 6. It is assumed that slot # (n+3) is aUL-centric slot in which the long PUCCH can be transmitted through 11OFDM symbols but transmission resources of the short PUCCH and the SRScollide with transmission resources of the long PUCCH in the last twoOFDM symbols, and thus the long PUCCH can be transmitted through 9 OFDMsymbols. At this time, in order to avoid a collision with transmissionresources of an uplink control channel in a short time region, such asthe short PUCCH or the SRS, a method by which the BS indicatestransmission resources of the long PUCCH to the UE is provided.

The method according to embodiment 1-2 of the disclosure may be broadlydivided into two methods. In the first method, in order to avoid acollision between transmission resources of the long PUCCH andtransmission resources of the uplink control channel in the short timeregion in a plurality of slots for which slot aggregation is configuredby a third signal, the BS directly indicates the transmission resourcesof the long PUCCH to the UE through a first signal. Accordingly, the UEdetermines the plurality of slots to which slot aggregation is appliedthrough the third signal and transmits the long PUCCH in thetransmission resources indicated by the plurality of slots throughreception of the first signal.

The first signal or the third signal may be configured by a highersignal, a physical signal, or a combination of the higher signal and thephysical signal. The first signal may include an OFDM symbol interval(or a start OFDM symbol and an end OFDM symbol) in the time region andPRBs in the frequency region for transmission of the long PUCCHcorresponding to the number of slots applied to slot aggregation inorder to apply the same to each slot of a plurality of slots to whichthe slot aggregation is applied. Alternatively, the first signal mayinclude an OFDM symbol interval (or a start OFDM symbol and an end OFDMsymbol) in the time region and PRBs in the frequency region fortransmission of the long PUCCH to be applied to a plurality of slots towhich the slot aggregation is applied in common. The third signalincludes relevant information for performing slot aggregation, such asinformation on the number of slots to which slot aggregation is appliedand information on the index of the slot to which slot aggregation isapplied.

In the second method, the BS directly/indirectly indicates transmissionresources of the long PUCCH in one slot to the UE in advance through afirst signal or definition according to a standard for correlatingtransmission resources of the long PUCCH from the number ofuplink/downlink OFDM symbols and the number of GP OFDM symbols of theslot and reduces or controls the indicated transmission resources of thelong PUCCH in a plurality of slots for which slot aggregation isconfigured through a second signal in order to avoid a collision withtransmission resources of an uplink control channel in a short timeregion in the plurality of slots for which slot aggregation isconfigured through a third signal. The UE determines a transmissioninterval of the long PUCCH in advance from reception of the first signalor the number of uplink/downlink OFDM symbols and the number of GP OFDMsymbols, determines a plurality of slots to which slot aggregation is tobe applied through the third signal, controls transmission resources ofthe long PUCCH in the plurality of slots through reception of the secondsignal, and transmits the long PUCCH. The first signal, the secondsignal, and the third signal may be configured by a higher signal, aphysical signal, or a combination of the higher signal and the physicalsignal.

The first signal includes the OFDM symbol interval (or the start OFDMsymbol and the end OFDM symbol) in the time region and PRBs in thefrequency region for transmission of the long PUCCH.

The second signal may include an OFDM symbol interval (or a start OFDMsymbol and an end OFDM symbol) in the time region and PRBs in thefrequency region, in which the long PUCCH cannot be transmitted,corresponding to the number of slots to which slot aggregation isapplied in order to apply the same to each slot of a plurality of slotsto which the slot aggregation is applied. Alternatively, the secondsignal may include an OFDM symbol interval (or a start OFDM symbol andan end OFDM symbol) in the time region and PRBs in the frequency region,in which the long PUCCH cannot be transmitted, in order to apply thesame to a plurality of slots to which the slot aggregation is applied incommon.

The third signal includes relevant information for performing slotaggregation, such as information on the number of slots to which slotaggregation is applied and information on the index of the slot to whichslot aggregation is applied.

The first method is suitable for uplink control channel transmissionsuch as periodic channel information transmission configured in the UEfor period transmission without a scheduling grant, and the secondmethod is suitable for uplink control channel transmission such asHARQ-ACK transmission configured in the UE for aperiodic transmissionwith a scheduling grant. Accordingly, whether to apply the first methodor the second method is determined according to whether the uplinkcontrol channel transmitted by the UE is triggered by the schedulinggrant or transmitted uplink control information is periodic channelinformation or HARQ-ACK. That is, the first method may be applied totransmission of the uplink control channel configured to be transmittedby the UE without a scheduling grant, and the second method may beapplied to the uplink control channel if transmission of the uplinkcontrol channel is triggered by the scheduling grant by the UE.

Alternatively, the UE may apply the first method to uplink controlchannel transmission corresponding to period channel informationtransmission and apply the second method to the uplink control channelfor transmitting HARQ-ACK information.

Alternatively, the BS may configure the UE to always apply the firstmethod or the second method through a higher signal. If the UE receivesconfiguration information for always applying the first method to theuplink control channel through a higher signal, the UE always appliesthe first method to transmit the uplink control channel. If the UEreceives configuration information for always applying the second methodto the uplink control channel through a higher signal, the UE alwaysapplies the second method to transmit the uplink control channel.

A detailed description of the first method and the second method will beprovided below.

-   -   In the first method, if slot aggregation is configured by a set        higher signal or if slot aggregation is indicated by a downlink        control channel, the BS indicates an OFDM symbol interval (for        example, a max. OFDM symbol interval) (or a start OFDM symbol        and an end OFDM symbol or whether the OFDM symbol in which long        PUCCH transmission should be avoided is the last symbol or the        last two OFDM symbols) for long PUCCH transmission to the UE        through the higher signal or the downlink control channel. The        downlink control channel may be common information to group UEs        or all UEs within the cell, or may be dedicated information        transmitted only to specific UEs.

In the above example, the BS may configure the long PUCCH transmissioninterval as OFDM symbols in which long PUCCH transmission can beperformed among 14 OFDM symbols available in slot # n, 12 OFDM symbolsavailable in slot #(n+1), 10 OFDM symbols available in slot #(n+2), and9 OFDM symbols available in slot #(n+3). For example, if the long PUCCHtransmission interval supports a number of OFDM symbols ranging from 4OFDM symbols to 12 OFDM symbols, the BS indicates long PUCCHtransmission in 9 OFDM symbols through a bit field of the downlinkcontrol channel and the UE transmits the long PUCCH in 9 OFDM symbols ineach of the four slots including slot # n to slot #(n+3). In anotherexample, if the long PUCCH transmission interval is configured as a setof the limited symbol interval through a higher signal or definedaccording to a standard, for example, if transmission is performed onlyin 4, 6, 8, 10, and 12 OFDM symbols through a higher signal or definedaccording to a standard, the BS indicates long PUCCH transmission in 8OFDM symbols through a bit field of the downlink control channel and theUE transmits the long PUCCH in 8 OFDM symbols in order to avoid acollision with short PUCCH or SRS transmission resources in all slotsbelonging to slot aggregation.

-   -   In the second method, if slot aggregation is configured through        a higher signal or slot aggregation is indicated by a downlink        control channel, the BS indicates in advance an OFDM symbol        interval (or a start OFDM symbol and an end OFDM symbol, or        whether the OFDM symbol in which long PUCCH transmission should        be avoided is the last OFDM symbol or the last two OFDM symbols)        for all slots belonging to slot aggregation to the UE.

The downlink control channel may be common information to group UEs orall UEs within the cell, or may be dedicated information transmittedonly to specific UEs. In the above example, the BS configures the longPUCCH transmission interval as 11 symbols to the UE through a highersignal, and indicates 14 OFDM symbols available in slot # n, 12 OFDMsymbols available in slot #(n+1), 10 OFDM symbols available in slot#(n+2), and 9 OFDM symbols available in slot #(n+3) through the downlinkcontrol channel. For example, if the long PUCCH transmission intervalsupports OFDM symbols ranging from 4 OFDM symbols to 12 OFDM symbols,the BS configures long PUCCH transmission in 11 OFDM symbols through ahigher signal and indicates whether long PUCCH transmission can betransmitted in the last OFDM symbol or the last two OFDM symbols in thefour slots from slot # n to slot #(n+3) through the downlink controlchannel. The UE receives the configuration information and indicationinformation and transmits the long PUCCH in 11, 11, 10, and 9 OFDMsymbols in the four slots from slot # n to slot #(n+3), respectively. Inanother example, if the long PUCCH transmission interval is configuredas a set of the limited symbol interval through a higher signal ordefined according to a standard, for example, if transmission isperformed only in 4, 6, 8, 10, 1.0 and 12 OFDM symbols through a highersignal or defined according to a standard, the BS indicates long PUCCHtransmission in 10 OFDM symbols through the higher signal and indicateswhether long PUCCH transmission can be performed in the last OFDM symbolor the last two OFDM symbols in the four slots from slot # n to slot#(n+3) through the downlink control channel in order to avoid acollision with short PUCCH or SRS transmission resources in all slotsbelonging to slot aggregation. The UE receives the configurationinformation and indication information and transmits the long PUCCH in10, 10, 10, and 8 OFDM symbols in the four slots from slot # n to slot#(n+3), respectively.

-   -   In the third method, the BS configures an OFDM symbol interval        (or a start OFDM symbol and an end OFDM symbol or OFDM symbols        in which transmission of the long PUCCH should be avoided) for        long PUCCH transmission to the UE through a higher signal. Short        PUCCH transmission frequency resources may be configured to have        distributed PRBs or localized PRBs.

If short PUCCH transmission frequency resources have distributed PRBs,there is a high probability of a collision with short PUCCH transmissionfrequency resources, so that the BS may prevent the long PUCCHtransmission OFDM symbol interval from being OFDM symbols (for example,the last OFDM symbol) in which the short PUCCH is transmitted through ahigher signal. For example, if the BS configures the long PUCCHtransmission interval as 8 OFDM symbols to the UE through a highersignal and is further configured to perform slot aggregation, the UEperforms long PUCCH transmission in 8 OFDM symbols in all slotsbelonging to slot aggregation.

-   -   In the fourth method, the BS configures whether to perform long        PUCCH transmission or short PUCCH transmission to the UE through        a higher signal or a physical downlink control signal and        correlates the OFDM symbol interval for long POUCCH transmission        with the number of uplink OFDM symbols according to a slot        format. At this time, the BS indicates information on whether        long PUCCH transmission can be performed in the last one or two        OFDM symbols in each or all of the slots belonging to slot        aggregation to the UE through the higher signal or the physical        signal. The UE may receive the configuration information and        determine whether to transmit the long PUCCH or the short PUCCH.        If the UE receives the indication information and performs long        PUCCH transmission, the UE determines whether long PUCCH        transmission can be performed in the last one or two OFDM        symbols in all slots belonging to slot aggregation. In the        indication information, one bit field may be applied to all        slots belonging to slot aggregation, or each bit field may be        applied to each slot. If one bit field is applied to all slots        belonging to slot aggregation, it is assumed that long PUCCH        transmission cannot be performed in the last OFDM symbol. If it        is assumed that uplink OFDM symbol intervals are 14, 12, 11, and        9 OFDM symbols in all slots belonging to slot aggregation, the        UE determines that long PUCCH transmission is performed in 14,        12, 11, and 9 OFDM symbols from the uplink OFDM symbol intervals        in the slots, receive the indication information, and performs        long PUCCH transmission in 13, 11, 10, and 8 OFDM symbols in the        slots. If the long PUCCH transmission is performed in 13, 11,        10, and 8 OFDM symbols, the long PUCCH symbols may be punctured        or rate-matched from the back on the basis of the long PUCCH        transmission in 14 OFDM symbols. Information on the uplink OFDM        symbol interval of the slot may be received by the UE from the        downlink control channel, and the downlink control channel may        be common information to group UEs or all UEs in the cell, or        may be dedicated information transmitted to specific UEs.

FIGS. 7A and 7B illustrate BS and UE procedures according to embodiment1-2 of the disclosure.

First, the BS procedure will be described.

In step 711, the BS transmits uplink control channel configurationinformation to the UE. The uplink Control channel configurationinformation may include frequency FRB resources of the long PUCCH or theshort PUCCH, an available set including at least one value of the timeOFDM symbol interval, information required for slot aggregation (thenumber of slots belonging to slot aggregation), or an available OFDMsymbol interval in which the long PUCCH can be transmitted in aplurality of slots belonging to slot aggregation, as described inconnection with FIG. 4 or FIG. 6, and the BS may transmit the uplinkcontrol channel configuration information to the UE through a highersignal in order to avoid a short PUCCH or long PUCCH transmissionresource collision between UEs.

In step 712, the BS transmits a downlink control channel to the UE. Thedownlink control channel may include the frequency PRBs of the shortPUCCH or the long PUCCH, the time OFDM symbol interval, the start OFDMsymbol and the end OFDM symbol, the bit field indicating the OFDM symbolin which transmission of the long PUCCH is avoided, information requiredfor slot aggregation (the number of slots belonging to slotaggregation), and the available OFDM symbol interval in which the longPUCCH can be transmitted in a plurality of slots belonging to slotaggregation, and the BS may transmit the downlink control channel to theUE in order to avoid a short PUCCH or long PUCCH transmission resourcecollision between UEs. The downlink control channel may be commoninformation to group UEs or all UEs within the cell or may be dedicatedinformation transmitted only to a specific UE.

In step 713, the BS receives an uplink control channel from the UE atthe short PUCCH or long PUCCH transmission time through frequencyresources indicated in step 711 or 712 over a plurality of slots.

Next, the UE procedure will be described.

In step 721, the UE receives uplink control channel configurationinformation from the BS, The uplink control channel configurationinformation may include frequency PRB resources of the long PUCCH or theshort PUCCH, an available set including at least one value of the timeOFDM symbol interval, information required for slot aggregation (thenumber of slots belonging to slot aggregation), or an available OFDMsymbol interval in which the long PUCCH can be transmitted in aplurality of slots belonging to slot aggregation, as described inconnection with FIG. 4 or FIG. 6, and the UE may receive the uplinkcontrol channel configuration information from the BS through a highersignal in order to avoid a short PUCCH or long PUCCH transmissionresource collision between UEs.

In step 722, the UE receives a downlink control channel from the BS. Thedownlink control channel may include the frequency PRBs of the shortPUCCH or the long PUCCH, the time OFDM symbol interval, the start OFDMsymbol and the end OFDM symbol, the bit field indicating the OFDM symbolin which transmission of the long PUCCH is avoided, information requiredfor slot aggregation (the number of slots belonging to slotaggregation), and the available OFDM symbol interval in which the longPUCCH can be transmitted in a plurality of slots belonging to slotaggregation, and the UE may receive the downlink control channel inorder to avoid a short PUCCH or long PUCCH transmission resourcecollision between UEs. The downlink control channel may be commoninformation to group UEs or all UEs within the cell, or may be dedicatedinformation transmitted only to a specific UE.

In step 723, the UE transmits an uplink control channel to the BS at theshort PUCCH or long PUCCH transmission time through frequency resourcesindicated in step 721 or 722 over a plurality of slots.

Next, FIG. 8 illustrates a BS apparatus according to the disclosure.

A controller 801 transmits the BS procedure according to FIG. 5 andFIGS. 7A and 7B of the disclosure and the uplink control channelconfiguration and the uplink control channel according to FIGS. 4 and 6of the disclosure to the UE through a 5G control informationtransmission device 805 and a 5G data transmission/reception device 807by controlling uplink control channel transmission resources accordingto a frequency transmission resource configuration method and transmitsand receives 5G data to and from the 5G UE through the 5G datatransmission/reception device 807 after a scheduler 803 schedules the 5Gdata.

Next, FIG. 9 illustrates a UE apparatus according to the disclosure.

The UE receives an uplink control channel transmission resource locationfrom the BS through a 5G control information reception device 905 and a5G data transmission/reception device 906 by receiving the UE procedureof FIGS. 5A and 5B and FIGS. 7A and 7B and the uplink control channelconfiguration and the uplink control channel of FIGS. 4 and 6 throughthe time and frequency transmission resource configuration method.

The embodiments disclosed in the specifications and drawings areprovided merely to readily describe and to help a thorough understandingof the disclosure but are not intended to limit the scope of thedisclosure. Therefore, it should be construed that, in addition to theembodiments disclosed herein, all modifications and changes or modifiedand changed forms derived from the technical idea of the disclosure fallwithin the scope of the disclosure.

Second Embodiment

In describing the exemplary embodiments of the disclosure, descriptionsrelated to technical contents which are well-known in the art to whichthe disclosure pertains, and are not directly associated with thedisclosure, will be omitted. Such an omission of unnecessarydescriptions is intended to prevent obscuring of the main idea of thedisclosure and more clearly transfer the main idea.

For the same reason, in the accompanying drawings, some elements may beexaggerated, omitted, or schematically illustrated. Further, the size ofeach element does not entirely reflect the actual size. In the drawings,identical or corresponding elements are provided with identicalreference numerals.

The advantages and features of the disclosure and ways to achieve themwill be apparent by making reference to embodiments as described belowin detail in conjunction with the accompanying drawings. However, thedisclosure is not limited to the embodiments set forth below, but may beimplemented in various different forms. The following embodiments areprovided only to completely disclose the disclosure and inform thoseskilled in the art of the scope of the disclosure, and the disclosure isdefined only by the scope of the appended claims. Throughout thespecification, the same or like reference numerals designate the same orlike elements.

Here, it will be understood that each block of the flowchartillustrations, and combinations of blocks in the flowchartillustrations, can be implemented by computer program instructions.These computer program instructions can be provided to a processor of ageneral purpose computer, special purpose computer, or otherprogrammable data processing apparatus to produce a machine, such thatthe instructions, which execute via the processor of the computer orother programmable data processing apparatus, create means forimplementing the functions specified in the flowchart block or blocks.These computer program instructions may also be stored in a computerusable or computer-readable memory that can direct a computer or otherprogrammable data processing apparatus to function in a particularmanner, such that the instructions stored in the computer usable orcomputer-readable memory produce an article of manufacture includinginstruction means that implement the function specified in the flowchartblock or blocks. The computer program instructions may also be loadedonto a computer or other programmable data processing apparatus to causea series of operational steps to be performed on the computer or otherprogrammable apparatus to produce a computer implemented process suchthat the instructions that execute on the computer or other programmableapparatus provide steps for implementing the functions specified in theflowchart block or blocks.

And each block of the flowchart illustrations may represent a module,segment, or portion of code, which includes one or more executableinstructions for implementing the specified logical function(s). Itshould also be noted that in some alternative implementations, thefunctions noted in the blocks may occur out of the order. For example,two blocks shown in succession may in fact be executed substantiallyconcurrently or the blocks may sometimes be executed in the reverseorder, depending upon the functionality involved.

As used herein, the “unit” refers to a software element or a hardwareelement, such as a Field Programmable Gate Array (FPGA) or anApplication Specific Integrated Circuit (ASIC), which performs apredetermined function. However, the “unit does not always have ameaning limited to software or hardware. The “unit” may be constructedeither to be stored in an addressable storage medium or to execute oneor more processors. Therefore, the “unit” includes, for example,software elements, object-oriented software elements, class elements ortask elements, processes, functions, properties, procedures,sub-routines, segments of a program code, drivers, firmware,micro-codes, circuits, data, database, data structures, tables, arrays,and parameters. The elements and functions provided by the “unit” may beeither combined into a smaller number of elements, “unit” or dividedinto a larger number of elements, “unit”. Moreover, the elements and“units” may be implemented to reproduce one or more CPUs within a deviceor a security multimedia card.

In order to process the recent explosive increase in mobile datatraffic, discussion on a 5^(th)-generation (5G) system or new radio (NR)access technology to replace long-term evolution (LTE) (or evolveduniversal terrestrial radio access (E-UTRA)) and LTE-advanced (LTE-A orE-UTRA Evolution) has been actively conducted. While the conventionalmobile communication system generally focuses on voice/datacommunication, the 5G system aims to meet various services andrequirements such as eMBB service, ultra-reliable low-latencycommunication service, and massive machine-type communication (MTC)supporting massive machine-to-machine communication.

While the bandwidth of a system transport band (transmission bandwidth)for a single carrier in the conventional LTE and LTE-A systems islimited to a maximum of 20 MHz, the 5G system mainly aims to support asuper-high-speed data service reaching several Gbps using an ultra-widebandwidth which is significantly wider than the LTE and LTE-A systems.Accordingly, the 5G system considers, as a candidate frequency, anultra-high-frequency band from several GHz in which guaranteeing anultra-wide bandwidth frequency is relatively easy to a maximum of 100GHz. In addition, securing a wide bandwidth frequency for the 5G systemby rearranging or allocating frequencies among the frequency bandsincluded in hundreds of MHz to several GHz used by the conventionalmobile communication system is under consideration.

The radio wave of the ultra-high-frequency band is also called amillimeter wave (mmWave), having a wavelength of several mm. However,since a propagation path loss increases in proportion to frequency bandin an ultra-high-frequency band, coverage of the mobile communicationsystem becomes smaller.

In order to remove the disadvantage of the decreased coverage of theultra-high-frequency band, a beam forming technology for increasing anarrival distance of the radio wave by concentrating the radiation energyof the radio wave on a predetermined target point through a plurality ofantennas is an important issue. That is, signals to which thebeamforming technology is applied have a relatively narrower beam width,and the arrival distance of the radio wave increases since radiationenergy is concentrated within the narrowed beam width. The beamformingtechnology may be applied to each of a transmission end and a receptionend.

The beamforming technology has not only a coverage increase effect butalso an effect of reducing interference in areas out of the beamformingdirection. In order to operate the beamforming technology, an accuratemethod of measuring and feeding back transmitted/received beams isneeded. The beamforming technology may be applied to a control or datachannel arranged between a predetermined UE and a predetermined BS inone-to-one correspondence. Further, in order to increase coverage, thebeamforming technology may be applied to a common signal that the BStransmits to a plurality of UEs within the system, for example, asynchronization signal, a physical broadcast channel (PBCH), and acontrol channel and a data channel for transmitting system information.

If the beamforming technology is applied to the common signal, abeam-sweeping technology for changing a beam direction and transmittinga signal may be additionally applied, and thus the common signal mayreach UEs positioned at a predetermined location within the cell.

Another requirement of the 5G system is an ultra-low-latency servicehaving a transmission delay between transmission and reception ends ofabout 1 ms. In order to reduce the transmission delay, it is required todesign a frame structure based on a shorter TTI compared to LTE andLTE-A. The TTI is a basic time unit for scheduling, and the TTI in theconventional LTE and LTE-A systems is 1 ms, corresponding to onesubframe length. For example, the short TTI to meet requirements of theultra-low-latency service of the 5G system may include TTIs of 0.5 ms,0.2 ms, and 0.1 ms, shorter than that of the conventional LTE and LTE-Asystems. Hereinafter, the frame structure of the LTE and LTE-A systemswill be described with reference to the accompanying drawings and thedesign direction of the 5G system will be described.

FIG. 10 illustrates the basic structure of the time-frequency resourceregion, which is the radio resource region in which data or a controlchannel of LTE and LTE-A systems is transmitted.

In FIG. 10, the horizontal axis indicates a time region and the verticalaxis indicates a frequency region. Uplink (UL) is a radio link throughwhich the UE transmits data or a control signal to the BS and downlink(DL) is a radio link through which the BS transmits data or a controlsignal to the UE. A minimum transmission unit in the time region of theLTE and LTE-A systems is an OFDM symbol in the case of downlink and is asingle-carrier frequency-division multiple access (SC-FDMA) symbol inthe case of the uplink, and one slot 1006 consists of N_(symb) symbols1002 and one subframe 1005 consists of two slots. The length of one slotis 0.5 ms, and the length of one subframe is 1 ms. A radio frame 1014 isa time region unit including ten subframes. The minimum transmissionunit in the frequency region is a subcarrier (subcarrier spacing 15kHz), and the entire system transport band (transmission bandwidth)consists of a total of N_(BW) subcarriers 1004.

The basic unit of resources in the time-frequency region is a resourceelement (RE) 112, and may be indicated by an OFDM symbol or an SC-FDMAsymbol index and a subcarrier index. A resource block (RB) (or physicalresource block (PRB)) 108 is defined by N_(symb) contiguous OFDM symbols1002 in the time region and N_(RB) contiguous subcarriers 1010 in thefrequency region. Therefore, one RB 1008 consists of N_(symb)×N_(RB) REs1012.

In the LTE and LTE-A systems, data is mapped in units of RBs, and the BSperforms scheduling in units of RB pairs included in one subframe for apredetermined UE. N_(symb), which is the number of SC-FDMA symbols orOFDM symbols, is determined according to the length of a cyclic prefix(CP) added to every symbol in order to prevent inter-symbolinterference, and, for example, N_(symb)=7 if a normal CP is applied andN_(symb)=6 if an expanded CP is applied. Compared to the normal CP, theexpanded CP may be applied to a system having a relatively longerpropagation transmission distance, thereby maintaining inter-symbolorthogonality.

The subcarrier spacing and the CP length are information necessary forOFDM transmission and reception, and smooth transmission and receptionare possible only when the BS and the UE recognize a common value as theinformation.

N_(BW) and N_(RB) are proportional to the bandwidth of the systemtransport band. The data rate increases in proportion to the number ofRBs scheduled to the UE.

The frame structure of the LTE and LTE-A systems is a design made inconsideration of normal voice and data communication and has alimitation on expandability to meet various services and requirementssuch as the 5G system. Accordingly, the 5G system is required toflexibly define and operate the frame structure in consideration ofvarious services and requirements.

FIGS. 11, 12, and 13 illustrate examples of the expanded framestructure.

In the examples of FIGS. 11, 12, and 13, a set of necessary parametersfor defining the expanded frame structure includes subcarrier spacing,CP length, and slot length. In the 5G system, the basic time unit toperform scheduling is a slot.

At the beginning of the 5G system, at least the coexistence of LTE/LTE-Asystem or dual-mode operation is expected. Accordingly, LTE/LTE-A mayprovide stable system operation and the 5G system may serve to providean improved service. Therefore, the expanded frame structure of the 5Gsystem needs to include at least the frame structure of LTE/LTE-A or aset of the necessary parameters.

FIG. 11 illustrates the 5G frame structure which is the same as theLTE/LTE-A frame structure or the necessary parameter set.

Referring to FIG. 11, in frame structure type A, subcarrier spacing is15 kHz, 14 symbols constitute a slot of 1 ms, and 12 subcarriers (=180kHz=12×15 kHz) constitute a PRB.

FIG. 12 illustrates a frame structure type B in which subcarrier spacingis 30 kHz, 14 symbols constitute a slot of 0.5 ms, and 12 subcarriers(=360 kHz=12×30 kHz) constitute a PRB. That is, compared to framestructure type A, the subcarrier spacing and the PRB size are twice aslarge and the slot length and the symbol length are half the size inframe structure type B.

FIG. 13 illustrates frame structure type C in which subcarrier spacingis 60 kHz, 14 symbols constitute a slot of 0.25 ms, and 12 subcarriers(=720 kHz=12×60 kHz) constitute a PRB. That is, compared to framestructure type A, the subcarrier spacing and the PRB size are four timesas large and the slot length and the symbol length are one fourth thesize in frame structure type C.

That is, when the frame structure type is generalized, the subcarrierspacing, the CP length, and the slot length that correspond to thenecessary parameter set of each frame structure type have therelationship of an integer multiple, thereby providing highexpandability. In order to indicate a reference time unit irrelevant tothe frame structure type, a subframe of a fixed length of 1 ms isdefined. Accordingly, one subframe consists of one slot in framestructure type A, one subframe consists of two slots in frame structuretype B, and one subframe consists of four slots in frame structure typeC.

The above-described frame structure types may be applied to correspondto various scenarios. From the viewpoint of cell size, a larger cell canbe supported as the CP length is longer, so that frame structure type Amay support a relatively larger cell than frame structure types B and C.From the viewpoint of the operation frequency band, a longer subcarrierspacing is advantageous for reconstruction of phase noise of a highfrequency band, and thus frame structure type C may support a relativelyhigher operation frequency than frame structure types A and B. From theviewpoint of service, as the slot length, which is the basic time unit,is shorter, it is more advantageous to support an ultra-low-latencyservice like URLLC, so that frame structure type C is relatively moresuitable for the URLLC service than frame structure types A and B.

Further, the several frame structure types may be multiplexed andintegratedly operated within one system.

[Table 2] shows the mutual correspondence relationship between thesubcarrier interval applied to a synchronization signal, the subcarrierspacing applied to a data channel or a control channel, and thefrequency band in which the system operates among the necessaryparameter set for defining the expanded frame structure. The UE performstime/frequency synchronization to the most appropriate cell through acell search in an initial access step in which the UE accesses thesystem and obtains system information from the corresponding cell. Thesynchronization signal is a signal which is the reference of the cellsearch, and subcarrier spacing suitable for a channel environment suchas phase noise is applied to each frequency band.

In the case of a data channel or a control channel, different subcarrierspacings are applied depending on the service type in order to supportvarious services as described above. However, since the cell search stepis a step before the UE transmits and receives data in earnest, it isrequired to minimize the increase in unnecessary UE complexity.Accordingly, subcarrier spacing applied to the synchronization signal ismaintained as a single value within the frequency band within which theUE performs the cell search.

According to the example of [Table 2], in frequency band A, thesubcarrier spacing applied to the synchronization signal is defined as asingle value of 15 kHz and the subcarrier spacing applied to the datachannel or the control channel is defined as a plurality of values of15, 30, and 60 kHz. In frequency band B, the subcarrier spacing appliedto the synchronization signal is defined as a single value of 30 kHz andthe subcarrier spacing applied to the data channel or the control isdefined as a plurality of values of 15, 30, and 60 kHz.

The subcarrier spacing to be actually applied to the data channel or thecontrol channel may be provided to the UE through higher-layer signalingor physical layer signaling. In [Table 2], it is assumed that frequencybands A, B, C, and D have the relationship A<B<C<D therebetween.

Frequency Subcarrier spacing Subcarrier spacing band (synchronizationsignal) (data channel) A  15 kHz 15, 30, 60 kHz B  30 kHz 15, 30, 60 kHzC 120 kHz 60, 120, 240 kHz D 240 kHz 60, 120, 240 kHz

FIG. 14 illustrates the time region mapping structure of asynchronization signal and a beam-sweeping operation according to thedisclosure. The following elements are defined for description.

-   -   Primary synchronization signal (PSS): indicates a signal which        is the reference of DL time or frequency synchronization.    -   Secondary synchronization signal (SSS): indicates signals which        is the reference of DL time or frequency synchronization and        provides cell ID information. In addition, the SSS serves as a        reference signal for demodulation of a PBCH.    -   Physical broadcast channel (PBCH): provides necessary system        information required for transmission/reception of a data        channel and a control channel by the UE. The necessary system        information may include search space-related control information        indicating radio resource mapping information of a control        channel and scheduling control information of a separate data        channel for transmitting system information.    -   Synchronization signal block (SS block): consists of N OFDM        symbols and includes a set of a PSS, an SSS, and a PBCH. In the        case of a system to which the beam-sweeping technology is        applied, the SS block is the minimum unit to which beam sweeping        is applied.    -   Synchronization signal (SS) burst: an SS burst consists of one        or more SS blocks. In the example of FIG. 14, each SS burst        consists of four SS blocks.    -   Synchronization signal (SS) burst set: consists of one or more        SS bursts and includes a total of L SS blocks.

In the example of FIG. 14, the SS burst set consists of a total of 12 SSblocks. The SS burst set periodically repeats in units of apredetermined period P. The period P is defined as a fixed valueaccording to a frequency band or is provided to the UE through signalingby the BS. If there is no separate signaling for the period P, the UEapplies a pre-appointed default value.

FIG. 14 illustrates the application of beam sweeping in units of SSblocks according to the passage of time.

In the example of FIG. 14, UE #1 1405 receives an SS block through abeam radiated in direction # d0 1403 by beamforming applied to SS block#0 at a time point t1 1401. UE #2 1406 receives an SS block through abeam radiated in direction # d4 1404 by beamforming applied to SS block#4 at a time point t2 1402. The UE may obtain, from the BS, an optimalsynchronization signal through a beam radiated in the direction in whichthe UE is located. For example, UE #1 1405 has difficulty in acquiringtime frequency synchronization and necessary system information from theSS block through the beam radiated in direction # d4, far away from thelocation of UE #1.

FIGS. 15A, 15B, and 15C illustrate examples of the configuration of theSS block. The SS block consists of N OFDM symbols. FIG. 15A illustratesan example in which the SS block consists of four OFDM symbols, FIG. 15Billustrates an example in which the SS block consists of three OFDMsymbols, and FIG. 15C illustrates an example in which the SS blockconsists of two OFDM symbols.

Referring to FIG. 15A, in the SS block consisting of four OFDM symbols,each of a PSS and an SSS is mapped to one OFDM symbol and PBCHs aremapped to two OFDM symbols in the time region through a time-divisionmultiplexing scheme. In a modified example, each of the PSS, the SSS,and the PBCH may be mapped to one OFDM symbol, and a tertiarysynchronization signal (TSS) indicating a time index of the SS block maybe additionally mapped to one OFDM symbol.

Referring to FIG. 15B, in the SS block consisting of three OFDM symbols,each of the PSS, the SSS, and the PBCH is mapped to one OFDM symbolthrough a TDM scheme. In a modified example, each of the PSS and the SSSmay be mapped to one OFDM symbol, and the TSS may be mapped to the OFDMsymbol, to which the PBCH is mapped, such that the TSS is multiplexedwith the PBCH in the frequency region through a frequency-divisionmultiplexing (FDM) scheme.

Referring to FIG. 15C, in the SS block consisting of two OFDM symbols,each of the PSS and the SSS is mapped to one OFDM symbol through a TDMscheme. In the case of FIG. 15C, in a scheme that can be applied to anon-standalone cell operating in a dependent mode in which a combinationwith a primary cell (Peen or anchor cell) is performed, the UE mayobtain necessary system information required by a non-standalone cellthrough signaling of the primary cell (Pcell or anchor cell). Signalingof the primary cell may include control information indicating the typeof the SS block of the non-standalone cell, for example, whether thePBCH is included.

Further, the mapping location of the PSS, the SSS, and the PBCH withinthe SS block illustrated in FIGS. 15A, 15B, and 15C can be variouslymodified.

As the method of achieving the ultra-low-latency service in the 5Gsystem, not only a method of introducing and operating the expandedframe structure but also a “self-contained” transmission scheme forperforming transmission of downlink data and HARQ-ACK/NACK feedback ofthe downlink data within the slot, which is the basic unit forperforming scheduling, have been researched. From the viewpoint oftransmission of uplink data, “self-contained” transmission means ascheme in which transmission of scheduling information of the BS forscheduling uplink data of the UE and transmission of uplink data of theUE corresponding thereto are performed in the same slot.

Hereinafter, at least six slot formats (slot format 1 to slot format 6)required to support the “self-contained” transmission will be describedwith reference to FIG. 16. In the example of FIG. 16, each slot consistsof a total of 14 symbols. Each slot format may be defined by acombination of a symbol 1607 for transmission of downlink controlinformation, a symbol 1608 for transmission of downlink data, a symbol1609 for a guard period (GP) for downlink-uplink switching, a symbol1610 for transmission of uplink data, and a symbol 1611 for transmissionof uplink control information. The symbols constituting each slot formatmay be configured in various combinations according to an amount ofcontrol information to be transmitted, an amount of data to betransmitted, or a time required when the UE switches an RF module fromdownlink to uplink. The BS may inform the UE of control informationindicating which format is applied among the slot formats throughsignaling.

Slot format #1 1601, slot format #2 1602, and slot format #3 1603 areslot formats for transmission of downlink data.

Slot format #1 1601 corresponds to a slot including symbols fortransmission of one or more pieces of downlink control information andsymbols for transmission of one or more pieces of downlink data, and allsymbols are used for downlink transmission.

Slot format #2 1602 corresponds to a slot including symbols fortransmission of one or more pieces of downlink control information,symbols for transmission of one or more pieces of downlink data, symbolsof one or more GPs, and symbols for transmission of one or more piecesof uplink control information, and has a characteristic in which symbolsfor downlink transmission and symbols for uplink transmission coexist inone slot. Accordingly, through slot format #2, the downlink“self-contained” transmission scheme may be supported.

In slot format #3 1603, all symbols are symbols for transmission ofdownlink data. Accordingly, slot format 3 may minimize overhead fortransmission of control information and thus maximize the efficiency oftransmission of downlink data.

Slot format #4 1604, slot format #5 1605, and slot format #6 1606 areslot formats for transmission of downlink data.

Slot format #4 1604 corresponds to a slot including symbols fortransmission of one or more pieces of downlink control information,symbols for one or more GPs, and symbols for transmission of one or morepieces of uplink data. That is, since symbols for downlink transmissionand symbols for uplink transmission coexist in one slot, the uplink“self-contained” transmission scheme may be supported through slotformat #4.

Slot format #5 1605 corresponds to a slot including symbols fortransmission of one or more pieces of downlink control information,symbols for one or more GPs, symbols for transmission of one or morepieces of uplink data, and symbols for transmission of one or morepieces of uplink control information. That is, since symbols fordownlink transmission and symbols for uplink transmission coexist in oneslot, the uplink “self-contained” transmission scheme may be supportedthrough slot format #5.

In slot format #6 1606, all symbols are symbols for the transmission ofuplink data. Accordingly, slot format #6 may minimize the overhead fortransmission of control information and thus maximize the efficiency oftransmission of uplink data.

SS-block mapping in the time region is influenced by the expanded framestructure, whether beam sweeping is applied, and the “self-contained”transmission scheme.

FIG. 17 illustrates various methods of mapping SS blocks in one slot.

Referring to reference numeral 1700 in FIGS. 17A to 17P, FIGS. 17A, 17B,and 17C illustrate a method of mapping three SS blocks in units of foursymbols in a slot consisting of 14 symbols.

FIGS. 17D, 17E, 17F, 17G, 17U, 17I, 17J, 17K, and 17I, illustrate amethod of mapping two SS blocks in units of four symbols in a slotconsisting of 14 symbols.

FIGS. 17M, 17N, 17O, and 17P illustrate a method of mapping one SS blockin units of four symbols in a slot consisting of seven symbols.

Downlink control information, downlink data, uplink control information,uplink data, and the GP may be mapped to symbols to which the SS blocksare not mapped in one slot.

FIG. 18 illustrates another method of mapping SS blocks in one slot.

Referring to reference numeral 1800 in FIGS. 18A to 18N, FIGS. 18A, 18B,and 18C illustrate a method of mapping four SS blocks in units of threesymbols in a slot consisting of 14 symbols.

FIGS. 18D, 18E, 18F, 18G, 18H, 18I, 18J, and 18K illustrate a method ofmapping three SS blocks in units of three symbols in a slot consistingof 14 symbols.

FIGS. 18L, 18M, and 18N illustrate a method of mapping two SS blocks inunits of three symbols in a slot consisting of seven symbols.

Similar to FIG. 17, downlink control information, downlink data, uplinkcontrol information, uplink data, and the GP may be mapped to symbols towhich the SS blocks are not mapped in one slot.

FIGS. 17A to 17P and FIGS. 18A to 18N illustrate various methods ofmapping SS blocks in one slot, but there is a need to define one fixedmapping pattern appointed between the UE and the BS in order to reducethe complexity of detection of SS blocks by the UE.

As illustrated in [Table 2] above, the subcarrier spacing applied to thesynchronization signal for each frequency band may be defined as asingle value, and the subcarrier spacing applied to the data channel orthe control channel may be defined as a plurality of values.

In the initial access step in which the UE performs a cell searchthrough SS block detection, as a step in which the UE transmits andreceives data in earnest, when a plurality of subcarrier spacings areapplied to the data channel or the control channel as described above,the UE is not able to accurately know which subcarrier spacing isactually applied to the data channel or the control channel.Accordingly, if mapping of the SS blocks in the time region is definedon the basis of the subcarrier spacing of the data channel or thecontrol channel, the UE assumes all subcarrier spacings and hascomplexity to perform the SS block detection operation. FIG. 19illustrates slot structures in the cases in which the subcarrierspacings applied to the data channel or the control channel are 15 kHz,30 kHz, 60 kHz, 120 kHz, and 240 kHz. If mapping of the SS block in thetime region is defined from OFDM symbol #4 in the slot,

-   -   if the subcarrier spacing applied to the data channel or the        control channel is 15 kHz, the SS block is mapped from the        location 1901,    -   if the subcarrier spacing applied to the data channel or the        control channel is 30 kHz, the SS block is mapped from the        location 1902,    -   if the subcarrier spacing applied to the data channel or the        control channel is 60 kHz, the SS block is mapped from the        location 1903,    -   if the subcarrier spacing applied to the data channel or the        control channel is 120 kHz, the SS block is mapped from the        location 1904,    -   if the subcarrier spacing applied to the data channel or the        control channel is 240 kHz, the SS block is mapped from the        location 1905.

That is, a problem of an increase in complexity may occur in that the UEshould find the mapping location of the SS block in consideration of allsubcarrier spacings applied to the data channel or the control channelsupported in the frequency band in which the cell search is attempted.

In order to solve the problem of the increase in complexity of the UE,“the frame structure of the data channel or the control channel” and“the synchronization signal frame structure” are separated and the SSblock is mapped to a fixed location according to “the synchronizationsignal frame structure” regardless of “the frame structure of the datachannel or the control channel”. Hereinafter, the main subject of thedisclosure will be described with reference to FIGS. 20, 21, 22, and 23.

FIGS. 20A, 20B, and 20C illustrate the cases in which the subcarrierspacing applied to the synchronization signal is 15 kHz and thesubcarrier spacings applied to the data channel or the control channelare 15 kHz (FIG. 20A), 30 kHz (FIG. 20B), and 60 kHz (FIG. 20C).

If the UE performs the cell search in frequency band A according to theexample of [Table 2], the UE recognizes that the subcarrier spacingapplied to the synchronization signal is fixed to 15 kHz regardless ofthe subcarrier spacings 15, 30, and 60 kHz that can be applied to thedata channel or the control channel. Further, mapping of the SS block inthe time region is applied on the basis of the “synchronization signalframe structure”. The length of symbols constituting the“synchronization signal frame structure” is determined by the subcarrierspacing 15 kHz applied to the synchronization signal. The biggest valueamong slot lengths supported by “the frame structure of the data channelor the control channel” in frequency band A is applied to the length ofthe SS slot, which is the slot of the “synchronization signal framestructure”. Accordingly, the length of the SS slot of the“synchronization signal frame structure” includes all slot lengths of“the frame structure of the data channel or the control channel”, andcommon SS-block mapping can be performed regardless of “the framestructure of the data channel or the control channel”. That is expressedas <Equation 1> below.

Length of SS slot of “synchronization signal frame structure”=max{slotlength of “frame structure of data channel or controlchannel”}  <Equation 1>

For example, if the length of one slot corresponds to 14 symbols in “theframe structure of the data channel or the control channel”, the slotlength of “the frame structure of the data channel or the controlchannel” is described below.

-   -   “the frame structure of the data channel or the control channel”        in which the subcarrier spacing is 15 kHz slot length 1 ms    -   “the frame structure of the data channel or the control channel”        in which the subcarrier spacing is 30 kHz slot length 0.5 ms    -   “the frame structure of the data channel or the control channel”        in which the subcarrier spacing is 60 kHz slot length 0.25 ms

Accordingly, the length of the SS slot of the “synchronization signalframe structure” is determined as a maximum slot length of 1 ms of “theframe structure of the data channel or the control channel”. The SS slotof 1 ms consists of 14 symbols according to “the synchronization signalframe structure”.

Based on the assumption of SS blocks, each of which consists of foursymbols, SS blocks #0, 41, and 02 are sequentially mapped in the orderof reference numerals 2001, 2002, and 2003 (or reference numerals 2004,2005, and 2006 or reference numerals 2007, 2008, and 2009), said blockscorresponding to common locations regardless of the frame structure ofthe data channel/control channel. For example, the location to which SSblock #0 is mapped is determined as the fixed location, such asreference numeral 2001 of FIG. 20A, reference numeral 2004 of FIG. 20B,or reference numeral 2007 of FIG. 2k C based on a predeterminedreference time point 2014 regardless of “the frame structure of the datachannel/control channel”.

If the BS transmits a downlink control channel or data channel to the UEor desires to receive an uplink control channel or data channel from theUE during the time interval to which the mapping structure of the SSblock is applied, an SS block transmission collision may be avoidedthrough the following methods.

-   -   Method 1: the BS or the UE transmits and receives a data channel        or a control channel in a frequency region that does not overlap        the bandwidth 2011 occupied by the SS block. Accordingly, the BS        differently configures and operates a search space for        determining mapping of radio resources of the downlink control        channel depending on whether a time interval is the time        interval in which the SS block is transmitted. That is, in the        time interval in which the SS block is transmitted, the search        space is mapped to a frequency region that does not overlap the        bandwidth occupied by the SS block. Accordingly, in the time        interval in which the SS block is transmitted, the UE detects a        downlink control channel in the frequency region that does not        overlap the bandwidth occupied by the SS block. Information on        the search space is provided to the UE by the BS using a        pre-appointed configuration therebetween or through signaling.    -   Method 2: the BS or the UE gives a high priority to SS block        transmission and performs no transmission/reception of a data        channel or a control channel in the interval which overlaps the        transmission time of the SS block.    -   Method 3: in order to reduce limitation on scheduling of the BS        within the SS slot in which the SS block is transmitted, a        minimum of the downlink signal transmission interval and the        uplink signal transmission interval are defined, and the SS        block that does not overlap the corresponding time interval is        transmitted. For example, priority is provided to a potential        symbol location 2012 at which a downlink control channel can be        transmitted and a potential symbol location of the GP or a        potential symbol location 2013 at which an uplink control        channel can be transmitted, and the SS block which overlaps the        corresponding location is defined as an invalid SS block. The BS        does not transmit the invalid SS block but transmits a valid SS        block to the UE. Further, transmission of a downlink signal or        an uplink signal which overlaps the transmission time point of        the invalid SS block is allowed.

FIGS. 20A, 20B, and 20C illustrate examples in which the potentialsymbol location 2012 at which the downlink control channel can betransmitted is limited to two symbols and the potential symbol locationof the GP or the potential symbol location 2013 at which the uplinkcontrol channel can be transmitted is limited to two symbols within theslot according to “the frame structure of the data channel or thecontrol channel”.

In this case, SS block #0 corresponds to the invalid SS block in theexample of FIG. 20A, SS block #0 and SS block #1 correspond to invalidblocks in the example of FIG. 20B, and SS block #0, SS block #1, and SSblock #2 correspond to invalid blocks in the example of FIG. 20C. In thecase of FIG. 20C, since there is no invalid SS block in the SS slot, itis necessary to allow transmission of at least one SS block in spite ofthe limit on transmission/reception of the downlink control channel orthe uplink control channel.

FIGS. 21A, 21B, and 21C illustrate the cases in which the subcarrierspacing applied to the synchronization signal is 30 kHz and thesubcarrier spacings applied to the data channel or the control channelare 15 kHz (FIG. 21A), 30 kHz (FIG. 21B), and 60 kHz (FIG. 21C).

If the UE performs the cell search in frequency band B according to theexample of [Table 2], the UE recognizes that the subcarrier spacingapplied to the synchronization signal is fixed to 15 kHz regardless ofthe subcarrier spacings 15, 30, and 60 kHz that can be applied to thedata channel or the control channel. Further, mapping of the SS block inthe time region is applied on the basis of the “synchronization signalframe structure”. The length of symbols constituting the“synchronization signal frame structure” is determined by the subcarrierspacing 30 kHz applied to the synchronization signal. The biggest valueamong slot lengths supported by “the frame structure of the data channelor the control channel” in frequency band B is applied to the length ofthe SS slot that is the slot of the “synchronization signal framestructure”. In the cases of FIGS. 21A to 21C, the length of the SS slotof “the synchronization signal frame structure” is defined as a maximumslot length of 1 ms of “the frame structure of the data channel or thecontrol channel”. Accordingly, the SS slot of 1 ms consists of 28symbols according to “the synchronization signal frame structure”.

Based on the assumption of SS blocks, each of which consists of foursymbols, SS blocks #0, #1, #2, #3, #4, #5, and #6 may be mapped duringthe SS slot length of 1 ms, said blocks corresponding to commonlocations regardless of “the frame structure of the data channel or thecontrol channel”.

For example, the location to which SS block #0 is mapped is determinedas a fixed location, such as reference numeral 2102 of FIG. 21A,reference numeral 2103 of FIG. 21B, or reference numeral 2104 of FIG.21C, based on a predetermined reference time point 2105 regardless of“the frame structure of the data channel/control channel”.

If the BS transmits a downlink control channel or data channel to the UEor desires to receive an uplink control channel or data channel from theUE during the time interval to which the mapping structure of the SSblock is applied, method 1, method 2, and method 3, described inconnection with FIG. 20, may be applied.

FIGS. 21A, 21B, and 21C illustrate examples in which a potential symbollocation 2106 at which the downlink control channel can be transmittedis limited to two symbols and a potential symbol location of the GP or apotential symbol location 2017 at which the uplink control channel canbe transmitted is limited to two symbols within the slot according to“the frame structure of the data channel or the control channel”.Accordingly, except for the invalid SS block, SS blocks #1, #2, #3, #4,and #5 correspond to valid blocks in the example of FIG. 21A, SS blocks#1, #2, #4, and #5 correspond to valid blocks in the example of FIG.21B, and SS blocks #2 and #4 correspond to valid blocks in the exampleof FIG. 21C.

SS blocks #2 and #4 commonly correspond to valid SS blocks regardless of“the frame structure of the data channel or the control channel”. The BSdoes not transmit an invalid SS block, but transmits a valid SS block tothe UE. Further, transmission of a downlink signal or an uplink signalwhich overlaps the transmission time point of the invalid SS block isallowed.

The invalid SS block may be additionally included in invalid SS blocksin the following cases.

-   -   The case in which SS blocks are mapped over a slot boundary        according to a “data channel” or a “control channel” is needed        for consistent SS-block mapping even though “the frame structure        of the data channel or the control channel” is changed. This        corresponds to SS block #3 in the example of FIG. 21B and SS        blocks #1, 43, and #5 in the example of FIG. 21C.    -   In the case in which first symbols located every 0.5 ms        according to “the frame structure of the data channel or the        control channel” overlap the SS block transmission interval, the        symbol length of the first symbols located every 0.5 ms for each        “frame structure of the data channel or the control channel” is        defined to be different from the remaining symbols.

Accordingly, in order to consistently maintain the SS block length, itis required to designate the SS block as an invalid SS block in theabove cases. This corresponds to SS blocks #0 and #3 in the examples ofFIGS. 21A, 21B, and 21C.

FIGS. 22A, 22B, and 22C illustrate the cases in which the subcarrierspacing applied to the synchronization signal is 120 kHz and thesubcarrier spacings applied to the data channel or the control channelare 60 kHz (FIG. 22A), 120 kHz (FIG. 22B), and 240 kHz (FIG. 22C).

If the UE performs the cell search in frequency band C according to theexample of [Table 2], the UE recognizes that the subcarrier spacingapplied to the synchronization signal is fixed to 120 kHz regardless ofthe subcarrier spacings 60, 120, and 240 kHz that can be applied to thedata channel or the control channel. Further, mapping of the SS block inthe time region is applied on the basis of the “synchronization signalframe structure”. The length of symbols constituting the“synchronization signal frame structure” is determined by the subcarrierspacing of 120 kHz applied to the synchronization signal. The biggestvalue among slot lengths supported by “the frame structure of the datachannel or the control channel” in frequency band C is applied to thelength of the SS slot, which is the slot of the “synchronization signalframe structure”. In the cases of FIGS. 22A to 22C, the length of the SSslot of “the synchronization signal frame structure” is defined as amaximum slot length of 0.25 ms of “the frame structure of the datachannel or the control channel”. Accordingly, the SS slot of 0.25 msconsists of 28 symbols according to “the synchronization signal framestructure”.

Based on the assumption of SS blocks, each of which consists of foursymbols, SS blocks #0, #1, #2, #3, #4, #5, and #6 may be mapped duringan SS slot 0.25 ms in length, said blocks corresponding to commonlocations regardless of “the frame structure of the data channel or thecontrol channel”. For example, the location to which SS block #0 ismapped is determined as a fixed location, such as reference numeral 2202of FIG. 22A, reference numeral 2203 of FIG. 21B, or reference numeral2204 of FIG. 21C based on a predetermined reference time point 2205regardless of “the frame structure of the data channel/control channel”.

If the BS transmits a downlink control channel or data channel to the UEor desires to receive an uplink control channel or data channel from theUE during a time interval to which the mapping structure of the SS blockis applied, method 1, method 2, and method 3, described in connectionwith FIG. 20, may be applied.

FIGS. 22A, 22B, and 22C illustrate examples in which a potential symbollocation 2206 at which the downlink control channel can be transmittedis limited to two symbols and a potential symbol location of the GP or apotential symbol location 2207 at which the uplink control channel canbe transmitted is limited to two symbols within the slot according to“the frame structure of the data channel or the control channel”.

Accordingly, SS blocks #1, #2, #3, #4, and $5 correspond to valid SSblocks in the example of FIG. 22A, SS blocks #2, #4, and #5 correspondto valid SS blocks in the example of FIG. 22B, and SS blocks #2 and #4correspond to valid SS blocks in the example of FIG. 22C. SS blocks #2and #4 commonly correspond to valid SS blocks regardless of “the framestructure of the data channel/control channel”. The BS does not transmitthe invalid SS block but G transmits the valid SS block to the UE.Further, transmission of a downlink signal or an uplink signal whichoverlaps the transmission time point of the invalid SS block is allowed.

FIGS. 23A, 23B, and 23C illustrate the cases in which the subcarrierspacing is 240 kHz and the subcarrier spacings applied to the datachannel or the control channel are 60 kHz (FIG. 23A), 120 kHz (FIG.23B), and 240 kHz (FIG. 23C).

If the UE performs the cell search in frequency band D according to theexample of [Table 2], the UE recognizes that the subcarrier spacingapplied to the synchronization signal is fixed to 240 kHz regardless ofthe subcarrier spacings 60, 120, and 240 kHz that can be applied to thedata channel or the control channel. Further, mapping of the SS block inthe time region is applied on the basis of the “synchronization signalframe structure”. The length of symbols constituting the“synchronization signal frame structure” is determined by the subcarrierspacing of 240 kHz applied to the synchronization signal. The biggestvalue among slot lengths supported by “the frame structure of the datachannel or the control channel” in frequency band D is applied to thelength of the SS slot which is the slot of the “synchronization signalframe structure”. In the cases of FIGS. 23A to 23C, the length of the SSslot of “the synchronization signal frame structure” is defined as amaximum slot length of 0.25 ms of “the frame structure of the datachannel or the control channel”. Accordingly, the SS slot of 0.25 msconsists of 56 symbols according to “the synchronization signal framestructure”.

Based on the assumption of SS blocks each of which consists of foursymbols, SS blocks #0, #1, #2, #3, #4, #5, #6, 47, #8, #9, #10, #11,#12, and #13 may be mapped during an SS slot length of 0.25 ms, saidblocks corresponding to common locations regardless of “the framestructure of the data channel or the control channel”.

For example, the location to which SS block #0 is mapped is determinedas a fixed location, such as reference numeral 2302 of FIG. 23A,reference numeral 2303 of FIG. 23B, or reference numeral 2304 of FIG.23C, based on a predetermined reference time point 2305 regardless of“the frame structure of the data channel/control channel”.

If the BS transmits a downlink control channel or data channel to the UEor desires to receive an uplink control channel or data channel from theUE during a time interval to which the mapping structure of the SS blockis applied, method 1, method 2, and method 3, described in connectionwith FIG. 20, may be applied.

FIGS. 23A, 23B, and 23C illustrate examples in which a potential symbollocation 2306 at which the downlink control channel can be transmittedis limited to two symbols and a potential symbols location of the GP ora potential symbol location 2307 at which the uplink control channel canbe transmitted is limited to two symbols within the slot according to“the frame structure of the data channel or the control channel”. SSblocks #2, #3, #4, #5, #6, #7, #8, #9, #10, and #11 correspond to validSS blocks in the example of FIG. 23A, SS blocks #1, #2, #3, #4, #5, #8,#9, #10, #11, and #12 correspond to valid SS blocks in the example ofFIG. 23B, and SS blocks #1, #2, #4, #5, #8, #9, #11, and #12 correspondto valid SS blocks in the example of FIG. 23C. SS blocks #2 #4, #5, #8,#9, #11, and #12 commonly correspond to valid SS blocks regardless of“the frame structure of the data channel or the control channel”. The BSdoes not transmit the invalid SS block, but transmits a valid SS blockto the UE. Further, transmission of a downlink signal or an uplinksignal which overlaps the transmission time point of the invalid SSblock is allowed.

FIGS. 24A and 24B illustrate examples of the mapping location of SSblocks within an SS burst set period.

FIG. 24A illustrates the case in which the subcarrier spacing applied tothe synchronization signal is 15 kHz and the subcarrier spacings appliedto the data channel or the control channel are 15 kHz, 30 kHz, and 60kHz. For example, if an SS burst set period is 10 ms and the SS blockconsists of four symbols, the time interval of 10 ms includes a maximumof 10 SS blocks and a maximum of 35 SS blocks.

In this case, the mapping is sequentially performed in an ascendingorder from a start point of the SS burst set period, that is, SS block#0, through the following methods.

-   -   Method A: indexes a maximum of SS blocks that can be configured        within the SS burst set period. In the example of FIG. 24A, SS        blocks from SS block #0 to SS block #34 can be indexed.    -   Method B: indexes valid SS blocks within the SS burst set        period. That is, the invalid SS blocks may be excluded from the        SS block indexing.

FIG. 248 illustrates the case in which the subcarrier spacing applied tothe synchronization signal is 30 kHz, as indicated by reference numeral2420, and the subcarrier spacings applied to the data channel or thecontrol channel are 15 kHz, 30 kHz, and 60 kHz. For example, if a periodof an SS burst set is 10 ms and the SS block consists of four symbols,the time interval of 10 ms includes a maximum of 10 SS blocks and amaximum of 70 SS blocks.

FIGS. 25A and 25B illustrate another method of mapping SS blocks withinthe SS burst set period.

FIG. 25A illustrates the case in which the subcarrier spacing applied tothe synchronization signal is 120 kHz, as indicated by reference numeral2510, and the subcarrier spacings applied to the data channel or thecontrol channel are 60 kHz, 120 kHz, and 240 kHz. For example, if aperiod of an SS burst set is 10 ms and the SS block consists of foursymbols, the time interval of 10 ms includes a maximum of 40 SS blocksand a maximum of 280 SS blocks.

FIG. 25B illustrates the case in which the subcarrier spacing applied tothe synchronization signal is 240 kHz, as indicated by reference numeral2520, and the subcarrier spacings applied to the data channel or thecontrol channel are 60 kHz, 120 kHz, and 240 kHz. For example, if aperiod of an SS burst set is 10 ms and the SS block consists of foursymbols, the time interval of 10 ms includes a maximum of 40 SS blocksand a maximum of 560 SS blocks.

The detailed mapping location of each signal included in the SS blockmay be expressed as follows.

For example, if the SS block consists of four symbols and is configuredin the order of a PSS, an SSS, a first PBCH symbol, and a second PBCHsymbol, each symbol is defined to be mapped to a location within the SSblock that meets the following conditions.

-   -   PSS symbol mapping location: maps a PSS to a symbol location        that meets symbol index % 4=0 according to the “synchronization        signal frame structure”.    -   SSS symbol mapping location: maps an SSS to a symbol location        that meets symbol index % 4=1 according to the “synchronization        signal frame structure”.    -   First PBCH symbol mapping location: maps a first PBCH symbol to        a symbol location that meets symbol index % 4=2 according to the        “synchronization signal frame structure”.    -   Second PBCH symbol mapping location: maps a second PBCH symbol        to a symbol location that meets symbol index % 4=3 according to        the “synchronization signal frame structure”.

In the above equations, A % B means the remainder after A is divided byB.

FIG. 26 illustrates a process in which the UE receives SS blocks throughan initial access procedure and switches to a connected mode.

In the initial access step in which the UE accesses the system, the UEfirst scans for an RF channel supported by the UE through a cell searchin step 2601. As illustrated in [Table 2] above, according to subcarrierspacing of a synchronization signal defined for each frequency band, theUE detects the corresponding synchronization signal. Further, asdescribed above, the UE attempts to detect a synchronization signal atthe location to which the synchronization signal can be mapped.

The cell search procedure may be sequentially performed on RF channelsaccording to implementation of the UE, or may be simultaneouslyperformed on a plurality of RF channels. In step 2602, the UE selects acell which meets a cell selection criteria on the basis of the searchresult. The UE selects a cell having a synchronization signal of whichthe signal intensity exceeds a predetermined threshold value, forexample, the highest signal intensity. In step 2603, the UE performstime/frequency synchronization from the synchronization signal for theselected cell and obtains a cell ID. The UE may additionally obtain abeam ID. In step 2604, the UE receives system information and obtainsbasic information for communication with the BS, Some of the systeminformation is transmitted through a PBCH, and some of the remainingsystem information is transmitted through a data channel for systeminformation transmission. In step 2605, the UE performs uplinktime/frequency synchronization through a random access procedure. If therandom access procedure is successfully completed, the UE switches alink to the BS from an idle state to a connected state in step 2606 andcompletes preparation for data transmission/reception to/from the BS.

As described above, in the initial access step, the UE may notaccurately know which subcarrier spacing was applied to the data channelor the control channel. That is, the UE may obtain configurationinformation of “the frame structure of the data channel or the controlchannel” after successfully completing the random access and enteringthe connected state. Accordingly, the UE may perform the procedure fordetecting the valid SS block differently depending on the UE state.

FIG. 27 illustrates a procedure of detecting an SS block according to anaccess state of the UE.

That is, if an access state 2701 of the UE is an idle state, the UEattempts to detect an SS block on the basis of assumption of a maximumof SS blocks in step 2702.

If the access state of the UE is a connected state and the UE obtainsconfiguration information of “the frame structure of the data channel orthe control channel”, the UE attempts to detect the SS block in valid SSblocks in consideration of the obtained configuration information of“the frame structure of the data channel or the control channel” in step2703. Accordingly, in the case in which the UE is in a connected state,it is possible to obtain an effect of reducing UE power consumption byminimizing unnecessary SS block detection operation.

FIG. 28 illustrates UE transmission and reception devices according tothe disclosure. For convenience of description, devices which are notdirectly relevant to the disclosure are neither illustrated nordescribed.

Referring to FIG. 28, the UE includes a transmitter 2804 including anuplink transmission-processing block 2801, a multiplexer 2802, and atransmission RF block 2803, a receiver 2808 including a downlinkreception-processing block 2805, a demultiplexer 2806, and a receptionRF block 2807, and a controller 2809.

The controller 2809 determines whether the UE has successfully completedthe random access procedure and the UE state (idle state or connectedstate) and controls element blocks of the receiver 2808 for receiving SSblock signals and element blocks of the transmitter 2804 fortransmitting uplink signals.

In the transmitter 2804 of the UE, the uplink transmission-processingblock 2801 performs a process such as channel coding and modulation andgenerates a signal to be transmitted. The signal generated by the uplinktransmission-processing block 2801 is multiplexed with another uplinksignal by the multiplexer 2802, signal-processed by the transmission RFblock 2803, and then transmitted to the BS.

The receiver 2808 demultiplexer the signal received from the BS anddistributes the signal to each downlink reception-processing block. Thedownlink reception-processing block 2805 performs a process such asdemodulation and channel decoding on the downlink signal of the BS andobtains control information or data transmitted by the BS. The receiver2808 of the UE applies an output result of the downlinkreception-processing block to the controller 2809 and supports theoperation of the controller 2809.

Although exemplary embodiments of the disclosure have been shown anddescribed in this specification and the drawings, they are used ingeneral sense in order to easily explain technical contents of thedisclosure, and to help comprehension of the disclosure, and are notintended to limit the scope of the disclosure. It is obvious to thoseskilled in the art to which the disclosure pertains that other modifiedembodiments on the basis of the spirits of the disclosure besides theembodiments disclosed herein can be carried out. Further, if necessary,the above respective embodiments may be employed in combination.

Third Embodiment

A wireless communication system has developed into a broadband wirelesscommunication system that provides a high-speed and high-quality packetdata service according to communication standards such as high-speedpacket access (HSPA) of 3GPP, long-term evolution (LTE) or evolveduniversal terrestrial radio access (E-UTRA), LTE-advanced (LTE-A),LTE-Pro, high-rate packet data (HRPD) of 3GPP2, ultra-mobile broadband(UMB), and 802.16e of IEEE, beyond the voice-based service provided atinitial stages.

In an LTE system, which is a representative example of broadbandwireless communication systems, a downlink (DL) adopts an OFDM schemeand an uplink (UL) adopts a single-carrier frequency division multipleaccess (SC-FDMA) scheme. The uplink is a radio link through which a UEor a mobile station (MS) transmits data or a control signal to a BS (oran eNode B), and the downlink is a radio link through which the BStransmits data or a control signal to the UE.

In the multiple access schemes described above, time-frequency resourcesfor carrying data or control information are allocated and operated in amanner to prevent overlapping of the resources, i.e. to establishorthogonality between users so as to identify data or controlinformation of each user.

A post-LTE communication system, that is, a 5G communication system,should be able to freely reflect the various requirements of a user anda service provider, and thus it is required to support a service whichsatisfies the various requirements. Services under consideration for the5G communication system include enhanced mobile broadband communication(eMBB), massive machine-type communication (mMTC), and ultra-reliablelow-latency communication (URLLC).

The eMBB aims to provide a data transmission rate that is improved so asto surpass the data transmission rate supported by LTE, LTE-A, orLTE-Pro. For example, in the 5G communication system, the eMBB shouldprovide a peak downlink data rate of 20 Gbps and a peak uplink data rateof 10 Gbps from the viewpoint of a single base station. Further, the 5Gcommunication system should provide not only the peak data rate but alsoan increased user-perceived data rate. In order to satisfy theserequirements, improvement of various transmission/receptiontechnologies, including a further improved multi-input multi-output(MIMO) transmission technology, is needed. Further, while the currentLTE system uses transmission bandwidths from a bandwidth of 2 GHz to amaximum bandwidth of 20 MHz to transmit signals, the 5G communicationsystem uses a frequency bandwidth wider than 20 MHz in frequency bandsof 3 to 6 GHz or greater than 6 GHz, whereby the data transmission raterequired by the 5G communication system can be satisfied.

Also, in order to support an application service such as the Internet ofThings (IoT), the implementation of mMTC is under consideration in the5G communication system. The mMTC is required to support access ofmassive numbers of UEs within a cell, improve coverage of the UE,increase a battery lifetime, and reduce the costs of the UE in order toefficiently provide IoT. IoT connects various sensors and devices toprovide a communication function, and thus should support a large numberof UEs (for example, 1,000,000 UEs/km²) within a cell. Further, sincethe UE supporting the mMTC is highly likely to be located in a shadearea, such as a basement, which a cell cannot cover due to the servicecharacteristics thereof, the mMTC requires wider coverage compared toother services provided by the 5G communication system. The UEsupporting the mMTC needs to be produced at low cost and it is difficultto frequently exchange a battery thereof, and thus a very long batterylifetime, for example, 10 to 15 years, is required.

Last, the URLLC is a cellular-based wireless communication service usedfor a particular (mission-critical) purpose. For example, services usedfor remote control of robots or machinery, industrial automation,unmanned aerial vehicles, remote health care, and emergency alerts maybe considered. Accordingly, communication provided by the URLLC shouldprovide very low latency and very high reliability. For example,services supporting the URLLS should satisfy a radio access delay time(air interface latency) shorter than 0.5 milliseconds and should alsohave requirements of a packet error rate equal to or smaller than 10⁻⁵.Accordingly, for services supporting URLLC, the 5G system should providea transmission time interval (TTI) smaller than that of other systemsand should also have design requirements of allocating wide resources ina frequency band in order to guarantee the reliability of acommunication link.

Three services of 5G, namely eMBB, URLLC, and mMTC, may be multiplexedand transmitted in one system. At this time, in order to meet thedifferent requirements of the respective services, differenttransmission/reception schemes and transmission/reception parameters maybe used for the services.

The frame structure of LTE and LTE-A systems is the same as thatdescribed with reference to FIG. 1, which will be omitted hereinafter.

Subsequently, downlink control information (DCI) in the LTE and LTE-Asystems will be described in more detail.

In the LTE system, scheduling information of downlink data or uplinkdata is transmitted from the base station to the UE through the DCI. TheDCI is defined in various formats, and a DCI format is operated throughthe application of one of various predefined DCI formats depending onwhether scheduling information is scheduling information of uplink dataor downlink data, whether the DCI is compact DCI having small sizecontrol information, and whether spatial multiplexing using multipleantennas is applied, and the DCI is DCI for controlling power. Forexample, the content contained in information on DCI format 1, which isscheduling control information of downlink data, is the same asdescribed above, and thus will be omitted hereinafter.

A cyclic redundancy check (CRC) is added to a DCI message payload and isscrambled to a radio network temporary identifier (RNTI) correspondingto the identity of the UE.

Depending on the purpose of the DCI message, for example, UE-specificdata transmission, a power control command, or a random access response,different RNTIs are used. The RNTI is not explicitly transmitted, but istransmitted while being included in a CRC calculation process. If theDCI message transmitted through the PDCCH is received, the UE mayidentify the CRC through the allocated RNTI, and may recognize that thecorresponding message is transmitted to the UE when the CRC isdetermined to be correct on the basis of the CRC identification result.

Next, a resource allocation (RA) method of the PDSCH in LTE and LTE-Asystems will be described in detail.

LTE supports three types of resource allocation schemes for the PDSCH,namely resource allocation type 0, resource allocation type 1, andresource allocation type 2.

Resource allocation type 0 supports allocation of non-contiguous RBs onthe frequency axis, and the allocation RBs are indicated using a bitmap.At this time, if the corresponding RBs are expressed using a bitmap forthe size, such as the number of RBs, a very large bitmap should betransmitted via a large cell bandwidth, thereby causing high controlsignaling overhead. Accordingly, resource allocation type 0 reduces thesize of the bitmap by grouping contiguous RBs and indicating the groupwithout directly indicating each RB in the frequency region. Forexample, if the total transmission bandwidth is N_(RB) and the number ofRBs per resource block group (RBG) is P, a bitmap required to indicateRB allocation information is N_(RB)/P in resource allocation type 0.There is an advantage of increasing flexibility of scheduling as thenumber of RBs per RBG, that is, P, is smaller, but also a disadvantageof increasing control signaling overhead. Accordingly, P should beappropriately selected to maintain flexibility of allocation ofsufficient resources and reduce the number of bits required.

In LTE, the RBG size is determined by a downlink cell bandwidth, and atthis time an available RBG size is as shown in [Table 3] below.

TABLE 3 System Bandwidth RBG Size N_(RB) ^(DL) (P) ≤10 1 11-26  2 27-63 3 64-110 4

In resource allocation type 1, resource allocation is performed suchthat all RBG sets on the frequency axis are divided into scattering RBGsubsets. The number of subsets is given from the cell bandwidth, and thenumber of subsets in resource allocation type 1 is the same as the groupsize (RBG size, P) in resource allocation type 0. RB allocationinformation of resource allocation type 1 includes three fields below.

-   -   First field: selected RBG subset indicator (log₂(P)) bits)    -   Second field: indicator indicating whether resource allocation        within subset is shifted (1 bit)    -   Third field: bitmap of allocated RBG((N_(RB)/P)−(log₂(P))−1        bits)

As a result, the total number of bits used by resource allocation type 1is (N_(RB)/P), which is the same as the number of bits required forresource allocation type 0. Accordingly, in order to inform the UEwhether the resource allocation type is 0 or 1, the 1-bit indicator isadded.

Unlike the two resource allocation types described above, resourceallocation 2 does not depend on the bitmap. Instead, resource allocationis expressed by a start point and a length of RB allocation.Accordingly, while both resource allocations 0 and 1 supportnon-contiguous RB allocation, resource allocation type 2 supports onlycontiguous RE allocation. As a result, RB allocation information ofresource allocation type 2 includes the two fields below.

-   -   First field: indicator indicating RB start point    -   Second field: indicator indicating length of consecutively        allocated RBs (L_(CRBs))

In resource allocation type 2, (log₂(N_(RB)(N_(RB)+1)/2 bits are used.

All of the three resource allocation types correspond to a virtualresource block (VRB). In resource allocation types 0 and 1, VRBs aredirectly mapped to PRBs in a localized manner. On the other hand, inresource allocation type 2, VRBs in both the localized and distributedtypes are supported. Accordingly, in resource allocation type 2, anindicator for identifying the localized and distributed VRBs is added.

FIG. 29 illustrates a PDCCH 2901 and an EPDCCH 2902, which are downlinkphysical channels for transmitting DCI in LTE.

Referring to FIG. 29, the PDCCH 2901 is multiplexed with a PDSCH 2903,which is a data transmission channel, on the time axis and istransmitted over the entire system bandwidth.

An area of the PDCCH 2901 is expressed by the number of OFDM symbols,which is indicated to the UE by a CFI transmitted through a physicalcontrol format indicator channel. By allocating the PDCCH 2901 to OFDMsymbols on the front part of the subframe, the UE may decode downlinkscheduling allocation as soon as possible, and thus a decoding delay fora downlink shared channel (DL-SCH), that is, an entire downlinktransmission delay, may be reduced. One PDCCH carries one DCI message,and a plurality of terminals is simultaneously scheduled on the downlinkand the uplink, so that transmission of a plurality of PDCCHs issimultaneously performed within each cell.

A CRS 2904 is used as a reference signal for decoding the PDCCH 2901.The CRS 2904 is transmitted in every subframe over the entire band, andscrambling and resource mapping vary depending on a cell identity (ID).Since the CRS 2904 is a reference signal used in common by all UEs,UE-specific beamforming cannot be used. Accordingly, a multi-antennatransmission scheme of the PDCCH in LTE is limited to open-looptransmission diversity. The number of ports of the CRS is implicitlymade known to the UE from decoding of a PBCH.

Resource allocation of the PDCCH 2901 is based on a control-channelelement, and one CCE consists of 9 resource element groups (REGs), thatis, a total of 36 REs. The number of CCEs required for a particularPDCCH 2901 may be 1, 2, 4, or 8, which varies depending on thechannel-coding rate of the DCI message payload. As described above,different numbers of CCEs may be used to implement link adaptation ofthe PDCCH 2901.

The UE is required to detect a signal without being aware of informationon the PDCCH 2901, so a search space indicating a set of CCEs is definedfor blind decoding in LTE. The search space includes a plurality of setsat an aggregation level (AL) of each CCE, which is not explicitlysignaled but is implicitly defined through a function using a UEidentity and a subframe number. In each subframe, the UE performsdecoding on the PDCCH 2901 with respect to all resource candidates thatcan be configured by CCEs within the set search space and processesinformation declared to be valid to the corresponding terminal throughidentification of the CRC.

The search space is classified into a UE-specific search space and acommon search space. UEs in a predetermined group or all UEs may searchfor a common search space of the PDCCH 2901 in order to receivecell-common control information such as dynamic scheduling of systeminformation or paging messages. For example, scheduling allocationinformation of the DL-SCH for transmission of system information block(SIB)-1 including service provider information of the cell may bereceived through the search for the common search space of the PDCCH2901.

Referring to FIG. 29, the EPDCCH 2902 is multiplexed on the frequencywith the PDSCH 2903. The BS may appropriately allocate resources of theEPDCCH 2902 and the PDSCH 2903 through scheduling and accordinglyeffectively support the coexistence with transmission of data for theexisting LTE UE. However, the EPDCCH 2902 is transmitted while beingallocated to the entirety of one subframe on the time axis, so thatthere is a problem in terms of transmission delay time. A plurality ofEPDCCHs 2902 constitutes a set of EPDCCHs 2902, and allocation of theset of EPDCCHs 2902 is performed in units of PRB pairs. Locationinformation of the set of EPDCCHs is configured in a UE-specific mannerand is signaled through radio resource control (RRC). Up to two sets ofEPDCCHs 2902 may be configured in each UE, and one set of EPDCCHs 2902may be simultaneously multiplexed and configured in different UEs.

Resource allocation of the EPDCCH 2902 is based on enhanced CCEs(ECCEs), one ECCE consists of 4 or 8 enhanced REGs (EREGs), and thenumber of EREGs per ECCE varies depending on a CP length and subframeconfiguration information. One EREG consists of 9 REs, and accordingly16 EREGs may exist per RPB pair. EPDCCH transmission types areclassified into localized and distributed transmission types accordingto the RE mapping scheme of EREGs. The aggregation level of the ECCEsmay be 1, 2, 4, 8, 16, or 32, which is determined by a CP length, asubframe configuration, an EPDCCH format, and a transmission scheme.

The EPDCCH 2902 supports only a UE-specific search space. Accordingly,the terminal that desires to receive a system message should necessarilysearch for a common search space on the existing PDCCH 2901.

Unlike the PDCCH 2901, the EPDCCH 2902 uses a demodulation referencesignal (DM-RS) 2905 as the reference signal for decoding. Accordingly,precoding for the EPDCCH 2902 may be configured by the BS, and may useUE-specific beamforming. Although UEs are not aware which kind ofprecoding is used through the DMRS 2905, the UEs may perform decodingfor the EPDCCH 2902. In the EPDCCH 2902, the same pattern as the DMRS ofthe PDSCH 2903 is used. However, unlike the PDSCH 2903, the DMRS 2905 ofthe EPDCCH 2902 may support transmission using a maximum of four antennaports. The DMRS 2905 is transmitted only in the corresponding PRBthrough which the EPDCCH is transmitted.

Port configuration information of the DMRS 2905 varies depending on thetransmission scheme of the EPDCCH 2902. In a localized transmissionscheme, an antenna port corresponding to the ECCE to which the EPDCCH2902 is mapped is selected on the basis of a UE ID. If different UEsshare the same ECCE, that is, if multiuser MIMO transmission is used,the DMRS antenna port may be allocated to each UE. Alternatively,transmission may be performed while sharing the DMRS 2905. In this case,the transmission may be identified by a DMRS 2905 scrambling sequenceconfigured through higher-layer signaling.

In the distributed transmission scheme, up to two antenna ports of theDMRS 2905 are supported, and a diversity scheme in a precoder cyclingtype is supported. All REs transmitted within one PRB pair may share theDMRS 2905.

The downlink control channel transmission schemes in LTE and LTE-A andthe RS for decoding the downlink control channel have been describedabove.

Hereinafter, the downlink control channel in the 5G communication systemwhich is currently under discussion will be described in more detailwith reference to the drawings.

FIG. 30 illustrates an example of a basic unit of time and frequencyresources included in a downlink control channel that can be used in 5G.

Referring to FIG. 30, the basic unit of time and frequency resources forthe control channel (named an REG, an NR-REG, or a PRB, and hereinafter,referred to as an NR-REG 3003 in the disclosure) is one OFDM symbol 3001on the time axis and 12 subcarriers 3002, that is, one RB, on thefrequency axis. On the assumption that the basic unit of the controlchannel on the time axis is one OFDM symbol 3001, a data channel and acontrol channel may be time-multiplexed within one subframe. It is easyto satisfy delay time requirements through a decrease in processing timeof the user by placing the control channel ahead of the data channel. Byconfiguring the basic unit of the control channel on the frequency axisas one RB 3003, frequency multiplexing between the control channel andthe data channel may be more efficiently performed.

Various sizes of control channel areas may be configured byconcatenating the NR-REG 3003 illustrated in FIG. 30. For example, if abasic unit for allocation of the downlink control channel in 5G is a CCE3004, one NR-CCE 3004 may consist of a plurality of NR-REGs 3003. Forexample, the NR-REG 3003 illustrated in FIG. 30 may consist of 12 REs,and if one NR-CCE 3004 consists of four NR-REGs 3003, the one NR-CCE3004 may consists of 48 REs. If a downlink control region is configured,the corresponding region may include a plurality of NR-CCEs 3004, and aparticular downlink control channel may be mapped to one or a pluralityof NR-CCEs 3004 according to an aggregation level (AL) within thecontrol region, and may then be transmitted. NR-CCEs 3004 within thecontrol region may be distinguished by numbers, and the numbers may beassigned according to a logical mapping scheme.

The basic unit of the downlink control channel illustrated in FIG. 30,that is, the NR-REG 3003, may include all of the REs to which the DCI ismapped and the region to which a DMRS 3005, which is a reference signalfor decoding the REs, is mapped. At this time, the DMRS 3005 may beefficiently transmitted in consideration of overhead due to RSallocation. For example, if the downlink control channel is transmittedusing a plurality of OFDM symbols, the DMRS 3005 may be transmitted onlythrough a first OFDM symbol. The DMRS 3005 may be mapped and transmittedin consideration of the number of antenna ports used for transmittingthe downlink control channel.

FIG. 30 illustrates an example in which two antenna ports are used. Atthis time, a DMRS 3006 transmitted for antenna port #0 and a DMRS 3007transmitted for antenna port #1 may exist. The DMRSs for differentantenna ports may be multiplexed in various ways.

FIG. 30 illustrates an example in which DMRSs corresponding to differentantenna ports are orthogonal and transmitted in different REs. Asillustrated in FIG. 30, the DMRSs may be transmitted in an FDM manner ora CDM manner. Further, various DMRS patterns may exist, which isrelevant to the number of antenna ports. Hereinafter, it is assumed thattwo antenna ports are used for description of the disclosure. However,the same principle of the disclosure can be applied to the case in whichtwo or more antenna ports are used.

FIG. 31 illustrates an example of a control region (control resourceset) in which a downlink control channel is transmitted in a 5G wirelesscommunication system.

FIG. 31 illustrates an example in which two control regions (controlregion #1 3101 and control region #2 3102) are configured within asystem bandwidth 3110 on the frequency axis and one slot 3120 on thetime axis (it is assumed that one slot consists of 7 OFDM symbols in theexample of FIG. 31).

The control regions 3101 and 3102 may be configured as particularsubbands 3103 in an entire system bandwidth 3110 on the frequency axis.The control regions 3101 and 3102 may be configured as one or aplurality of OFDM symbols on the time axis, which may be defined as acontrol region length (control resource set duration) 3104. In theexample of FIG. 31, control region #1 3101 is configured as the controlregion length of two symbols and control region #2 3102 is configured asthe control region length of one symbol.

In 5G, a plurality of control regions may be configured within onesystem from the viewpoint of the BS. Further, a plurality of controlregions may be configured to one UE from the viewpoint of the UE. Inaddition, some of the configured control regions within the system maybe configured to the UE. Accordingly, the UE may not know whether aparticular control region exists within the system. In a detailedexample, two control regions including control region #1 3101 andcontrol region #2 3102 are configured within the system of FIG. 31, andcontrol region #1 3101 may be configured to UE #1 and control region #13101 and control region #2 3102 may be configured to UE #2. At thistime, if there is no additional indicator, UE #1 may not know whethercontrol region #2 3102 exists.

The control region in 5G may be configured as a common control region, aUE-group common region, or a UE-specific region. The control region maybe configured to each UE through UE-specific signaling, UE-group commonsignaling, or RRC signaling. Configuring the control region to the UEmeans providing information such as the location of the control region,a subband, resource allocation of the control region, and the controlregion length.

FIG. 32 illustrates an example of a method of mapping downlink controlchannels in the 5G wireless communication system.

It is assumed that one NR-CCE 3210 consists of four NR-REGs 3220 in FIG.32. Further, it is assumed that a control region length 3230 is threeOFDM symbols.

A resource mapping type considered in FIG. 32 is a mapping type betweenthe NR-CCE 3210 and the REG 3220. Methods of mapping a plurality ofNR-REGs 3220 to one NR-CCE 3210 may include localized mapping anddistributed mapping. Localized mapping is a mapping type of configuringone NR-CCE 3210 by a plurality of contiguous NR-REGs 3220. Distributedmapping is a mapping type of configuring one NR-CCE 3210 by a pluralityof non-contiguous NR-REGs 3220.

Methods of mapping the NR-REGs 3220 to one NR-CCE 3210 may includetime-first mapping and frequency-first mapping. Time-first mapping meansfirst mapping two-dimensional resources for frequency and time to thetime region when mapping a plurality of NR-REGs 3220 to one NR-CCE 3210.Similarly, frequency-first mapping means first mapping two-dimensionalresources for frequency and time to the frequency region when mapping aplurality of NR-REGs 3220 to one NR-CCE 3210.

FIG. 32 illustrates an example of a total of four mapping types.

Reference numeral 3201 indicates an example of localized mapping andfrequency-first mapping in which contiguous NR-REGs 3220 are mapped toone NR-CCE 3210. Reference numeral 3202 indicates an example oflocalized mapping and time-first mapping in which contiguous NR-REGs3220 are mapped to one NR-CCE 3210. Reference numeral 3203 indicates anexample of distributed mapping and frequency-first mapping in whichnon-contiguous NR-REGs 3220 are mapped to one NR-CCE 3210. Referencenumeral 3204 indicates an example of distributed mapping and time-firstmapping in which non-contiguous NR-REGs 3220 are mapped to one NR-CCE3210.

The downlink control channel in the 5G communication system which iscurrently under discussion will be described in detail with reference tothe drawings.

As described above, the downlink control channel may be transmittedwithin the configured control region in 5G. In order to increase theefficiency of use of resources, data, for example, the PDSCH may betransmitted in the remaining regions that are not actually used for DCItransmission in the control regions. At this time, PDSCHs transmitted inthe control region may start to be transmitted at different startpoints, that is, at different OFDM symbols. Accordingly, if someresources of the control region which is not used are used for datatransmission, additional signaling for the data start point may beneeded. If PDSCHs are multiplexed in the state in which a plurality ofresource regions exists within a plurality of systems, not onlysignaling for the data start point but also various kinds of signalingfor resource region configuration information may be needed. Further, anindicator indicating whether there is DCI transmission by another useraccording to rate matching or puncturing of the PDSCH transmitted withinthe control region may be needed. As a result, there may be a tradeoffbetween increased resource usage efficiency according to resourcesharing between the data channel and the control channel and overheadaccording to additional signaling. Accordingly, the disclosure providesa method of efficiently sharing resources between the data channel andthe control channel in 5G and a method and an apparatus for additionalsignaling to support the same.

Hereinafter, exemplary embodiments of the disclosure will be describedin detail with reference to the accompanying drawings. Here, it is notedthat identical reference numerals denote the same structural elements inthe accompanying drawings. Further, a detailed description of a knownfunction and configuration which may make the subject matter of thedisclosure unclear will be omitted.

Further, although the following detailed description of embodiments ofthe disclosure will be directed to the 3GPP LTE standard, it can beunderstood by those skilled in the art that the main gist of thedisclosure may also be applied to any other communication system havingsimilar technical backgrounds and channel formats, with a slightmodification, without substantially departing from the scope of thedisclosure.

Hereinafter, various embodiments of resource sharing between the datachannel and the control channel proposed by the disclosure will bedescribed.

Embodiment 3-1

FIG. 33 illustrates an example of a method of sharing resources betweena data channel and a control channel according to embodiment 3-1 of thedisclosure.

More specifically, FIG. 33 illustrates an example in which two controlregions, that is, control region #1 3330 and control region #2 3340, areconfigured within time and frequency resources including a systembandwidth 3310 on the frequency axis and one slot 3320 on the time axis.In FIG. 33, a control region length of control region #1 3330 isconfigured as control region length #1 3350 and a control region lengthof control region #2 3340 is configured as control region length #23360.

Referring to FIG. 33, it is assumed that control region #1 3330 isconfigured for UE #1, and control region #1 3330 and control region #23340 are configured for UE #2 in the disclosure. Further, it is assumedthat DCI #1 3312, which is a control signal for UE #1, is transmitted incontrol region #1 3330, and that DCI #2 3313, which is a control signalfor UE #2, is transmitted in control region #1 3330 and control region#2 3340 in FIG. 33. In control region #1 3330 and control region #23340, resources 3314 which are not used for transmission of DCI #1 3312and DCI #2 3313 may exist. Further, it is assumed that PDSCH #1 3313,which is a data channel for UE #1, is transmitted in FIG. 33. FIG. 33 isonly an example for convenience of description of the disclosure, and itis noted that FIG. 33 does not limit the disclosure to a specificsituation. The disclosure may be equally applied to various transmissionenvironments through slight modification thereof without departing fromthe scope of the disclosure.

Embodiment 3-1-1

In an example corresponding to reference numeral 3301 of FIG. 33,control region #1 3330 configured for UE #1 exists on the frequency forscheduling of PDSCH #1 3311, which is a data channel of UE #1.

At this time, in the time domain, the BS may perform scheduling suchthat PDSCH #1 3311 starts after control region length #1 3350,corresponding to the time axis region of control region #1 3330. Inother words, a data start point of PDSCH #1 3311 may be designated to a(control region length #1 3350+1)^(th) symbol. In this case, UE #1 knowsin advance configuration information of control region #1, and thus isable to implicitly know the location of the data start point of PDSCH #13311 from control region length #1 3350.

Embodiment 3-1-2

In an example corresponding to reference numeral 3302 of FIG. 33,control signal #1 3330 exists and DCI #1 3312, which is a controlchannel of UE #1, is transmitted at the frequency location forscheduling of PDSCH 3311, which is a data channel of UE #1. At thistime, PDSCH #1 3311 may be scheduled while reusing unused resources 3314within the control region and a portion of PDSCH #1 3311 which overlapstransmission resources of DCI #1 3312 may be rate-matched.

UE #1 may obtain information on transmission resources of DCI #1 3312through blind decoding, and thus is able to implicitly know which partof PDSCH #1 3311 is rate-matched. Because PDSCH #1 3311 may betransmitted within control region #1 3330, an indicator of the datastart point may be additionally transmitted.

Embodiment 3-1-3

In an example corresponding to reference numeral 3303 of FIG. 33,control region #1 3330 exists, and DCI #2 3313, which is a controlchannel of UE #2, is transmitted at the frequency location forscheduling of PDSCH #1 3311, which is a data channel of UE #1. At thistime, PDSCH #1 3311 may be scheduled while resources 3314, which are notused within the control region, are reused and a portion of PDSCH #13311 which overlaps transmission resources of DCI #1 3313 may berate-matched or punctured. If the rate-matching is performed, anadditional indicator indicating a rate-matched portion of PDSCH #1 3311may be transmitted since UE #1 is not aware of transmission resources ofDCI #2 3313. If puncturing is performed, UE #1 may directly decode PDSCH#1 3311. Because PDSCH #1 3311 may be transmitted within control region#1 3330, an indicator of the data start point may be additionallytransmitted.

Embodiment 3-1-4

In an example corresponding to reference numeral 3304 of FIG. 33,control region #1 3330 exists and DCI #2 3313, which is a control signalof UE #2, is transmitted at the frequency location for scheduling ofPDSCH #1 3311, which is a data channel of UE #1. At this time, PDSCH #13311 may be scheduled while reusing unused resources within the controlregion and avoiding transmission resources of DCI #2 3313. For example,if DCI #2 3313 is transmitted in a first OFDM symbol in control region#1 3330, PDSCH #1 3311 may be transmitted starting at a second OFDMsymbol, which is a symbol after DCI #2 3313 is transmitted. As PDSCH #13311 may be transmitted within control region #1 3330, an indicator ofthe data start point may be additionally transmitted.

Embodiment 3-1-5

In an example corresponding to reference numeral 3305 of FIG. 33, thereis no control region configured at the frequency location for schedulingof PDSCH #1 3311, which is a data channel of UE #1. At this time, PDSCH#1 3311 may be transmitted starting at a first OFDM system. At thistime, since control region length #1 3350 corresponding to the time axisregion of control region #1 configured to UE #1 and PDSCH #1 3311 may bedifferent, an indicator of the data start point may be additionallytransmitted.

Embodiment 3-1-6

An example corresponding to reference numeral 3306 of FIG. 33 shows thecase in which there is no control region configured in the frequencylocation at which PDSCH #1 3311, which is a data channel of UE #1, isscheduled or there is control region #2 3340, which is not configuredfor UE #1. At this time, PDSCH #1 3311 may be scheduled to start aftercontrol region length #1 3350, corresponding to the time axis region ofcontrol region #1 3330 configured to UE #1. In this case, UE #1 is madeaware in advance of configuration information of control region #1, andthus is able to implicitly know the location of the data start point ofPDSCH #1 3311 from control region length #1 3350.

Embodiment 3-1-7

In an example corresponding to reference numeral 3307 of FIG. 33,control region #2 3340, which is not configured to UE #1, exists at thefrequency location for scheduling of PDSCH #1 3311, which is a datachannel of UE #1. At this time, in the time domain, the BS may performscheduling such that PDSCH #1 3311 starts after control region length #23360, corresponding to the time axis region of control region #2 3330.In other words, a data start point of PDSCH #2 3311 may be designated toa (control region length #2 3360+1)^(th) symbol.

In this case, since UE #1 is not aware of configuration information ofcontrol region #2 3330, an indicator for the data start point of PDSCH#1 3311 may be additionally transmitted. Alternatively, configurationinformation of control region #2 3340 (for example, information on thefrequency location of control region #2 3340 and control region length#2 3360) may be provided to UE #1, and UE #1 may be implicitly aware ofthe start point of PDSCH #1 3311 from control region length #2 3360.

Embodiment 3-1-8

PDSCH #1 3311 which is a data channel of UE #1, may be scheduled andtransmitted over the entire system band 3310. More specifically, atleast two of the examples of transmission of PDSCH #1 3311,corresponding to reference numerals 3301, 3302, 3303, 3304, 3305, 3305,3306, and 3307 of FIG. 33, may be simultaneously performed. In thiscase, the above-described embodiments may be complexly applied to themethod of sharing resources between the data channel and the controlchannel. The data start point may be differently applied depending onthe frequency location at which PDSCH #1 3311 is scheduled.

In a detailed example, it is assumed that PDSCH #1 3311 is scheduledover the entire system band 3310 and thus a portion of PDSCH #1 3311 isscheduled and transmitted in a region 3302 and the remaining portions ofPDSCH #1 3311 are scheduled and transmitted in a region 3307 in FIG. 33.In this case, the portion of PDSCH #1 3311 in the region 3302 may betransmitted according to embodiment 3-1-2 and thus transmitted startingat a first OFDM symbol. The remaining portions of PDSCH #1 3311 in theregion 3302 may be transmitted according to embodiment 3-1-7 and thustransmitted starting at a second OFDM symbol. Accordingly, the datastart point may be different for each portion of PDSCH #1 3311 dependingon the frequency region to which PDSCH #1 3311 is allocated. In thiscase, a plurality of indicators for the data start points may betransmitted.

Embodiment 3-1-9

PDSCH #1 3311, which is a data channel of UE #1, may be scheduled andtransmitted over the entire system band 3310, and at least two of theexamples of transmission of PDSCH #1 3311 corresponding to referencenumerals 3301, 3302, 3303, 3304, 3305, 3306, and 3307 of FIG. 33 may besimultaneously performed. In this case, the above-described embodimentsmay be complexly applied to the method of sharing resources between thedata channel and the control channel. However, the data start points maybe equally scheduled regardless of the frequency location at which PDSCH#1 3311 is scheduled. In a detailed example, it is assumed so that PDSCH#1 3311 is scheduled over the entire system band 3310 and thus a portionof PDSCH #1 3311 is scheduled and transmitted in a region 3302 and theremaining portions of PDSCH #1 3311 are scheduled and transmitted in aregion 3307 in FIG. 33.

In this case, the portion of PDSCH #1 3311 in the region 3302 may betransmitted according to embodiment 3-1-2 and thus transmitted startingat a first OFDM symbol. The remaining portions of PDSCH #1 3311 in theregion 3302 may be transmitted according to embodiment 3-1-7 and thustransmitted starting at a second OFDM symbol. However, the BS may selectone of different data start points according to each portion of PDSCH #13311 and determine the selected data start point as a data start pointof whole PDSCH #1 3311. For example, the biggest value among a pluralityof data start points of the portions may be selected as the total datastart point. Accordingly, in this case, only one indicator for the datastart point may be transmitted.

The method of sharing resources between the data channel and the controlchannel and necessary signaling have been described through variousembodiments. As described above, in order to efficiently supportresource sharing between the data channel and the control channel, atradeoff between the increase in resource efficiency according toresource sharing and overhead according to signaling required forsupporting the same should be considered.

Hereinafter, a resource-sharing method of more efficiently supportingresource sharing between the data channel and the control channel in 5Gand a signaling method thereof will be described with reference tovarious embodiments.

Embodiment 3-2

FIG. 34 illustrates an example of a method of sharing resources betweenthe data channel and the control channel according to embodiment 3-2 ofthe disclosure.

More specifically, FIG. 34 illustrates an example in which two controlregions, that is, control region #1 3440 and control region #2 3450, areconfigured within time and frequency resources including a systembandwidth 3410 on the frequency axis and one slot 3420 on the time axis(it is assumed that one slot=seven symbols 3430).

In FIG. 34, a control region length of control region #1 3440 isconfigured as control region length #1 3460 and a control region lengthof control region #2 3450 is configured as control region length #23470. In the example of FIG. 34, some parts of a PDSCH 3401 may bescheduled through predetermined resources within the system band 3410.In scheduling of the PDSCH 3401, resource allocation may be performedusing various resource-sharing methods according to embodiment 3-1described above in consideration of resource regions 3440 and 3450configured within the system. Accordingly, respective parts of the PDSCH3401 may have different start points according to the allocatedfrequency location.

In embodiment 3-2 of the disclosure, in order to support resourceallocation having a plurality of data start points for one PDSCH 3401,the BS may transmit indicators for the plurality of data start points.At this time, the PDSCH 3401 may be partitioned to reduce signalingoverhead according to transmission of the plurality of indicators, andmay be scheduled to have the same data start point in the respectiveparts of the PDSCH 3401. This will be described in more detail withreference to the drawings.

FIG. 34 illustrates an example in which the PDSCH 3401 is partitionedinto three data parts, that is, data part #1 3402, data part #2 3403,and data part #3 3404. The data parts 3401, 3402, and 3403 may includeone or a plurality of RBs or RBGs. FIG. 34 illustrates an example inwhich each of the data parts 3401, 3402, and 3403 consists of two RBGs.The data parts 3401, 3402, and 3403 of the PDSCH 3401 may be scheduledin units of RBGs without any restriction on the frequency axis as in theconventional way. (It is assumed that the PDSCH is scheduled in units ofRBGs for convenience of description of the disclosure. The scheduling inunits of RBGs is a concept basically including scheduling in units ofRBs.) At this time, the data parts 3401, 3402, and 3403 may be scheduledat a predetermined frequency location and may have different data startpoints depending on the method of reusing resources for the controlregion and whether resources for the control region are reused. At thistime, when the data start point of the PDSCH 3401 is determined, allRBGs existing in the data parts 3401, 3402, and 3403 may be scheduled tohave the same data start point. As a result, the data start point may bedifferent for each of the data parts 3401, 3402, and 3403.

In the example of FIG. 34, the data start point of data part #1 3402 maybe scheduled and transmitted in a first OFDM system, the data startpoint of data part #2 3403 may be scheduled and transmitted in a thirdOFDM symbol, and the data start point of data part #3 3404 may bescheduled and transmitted in a second OFDM symbol. The BS may transmitindicators for the data start points of the data parts 3401, 3402, and3403, and the UE may decode the PDSH 3401 on the basis of resourceallocation information of the PDSCH 3401 and information on the datastart points of the data parts 3401, 3402, and 3403.

Partitioning configuration information (for example, the number ofparts) of the PDSCH 3401 may be used as a value appointed by a systemparameter. Alternatively, partitioning configuration information of thePDSCH may be implicitly determined by other system parameters, forexample, a system bandwidth, the number of configured resource regions,resource region configuration information, a slot length, and whetherslots are aggregated. Alternatively, the partitioning configurationinformation may be provided to the UE through a master information block(MIB) or a system information block (SIB) as cell-common systeminformation. Alternatively, the partitioning configuration informationmay be semi-statically configured to the UE through higher-layersignaling, for example, RRC signaling and MAC CE signaling. The datastart point indicators for the data parts 3401, 3402, and 3403 may bedynamically transmitted through UE-specific DCI.

Embodiment 3-2 of the disclosure may include an operation for indicatingone data start point for one PDSCH 3401. For example, if the number ofdata parts is configured as one, one indicator may be transmitted forthe data start point.

FIGS. 35A and 35B illustrate BS and UE operations according to thedisclosure.

First, the BS procedure will be described with reference to FIG. 35A.

The BS performs resource allocation for a downlink control channel instep 3501.

The BS performs resource allocation for a downlink data channel in step3502. At this time, the BS may perform resource allocation for a datachannel on the basis of the method of sharing resources between the datachannel and the control channel according to embodiment 3-2 of thedisclosure described above. That is, the data channel may be partitionedinto a plurality of data parts and scheduled at different data startpoints. Further, the BS may perform resource allocation on the basis ofthe method of sharing resources between the data channel and the controlchannel according to embodiment 3-1 described above. The BS mayadditionally transmit a data start point indicator for each data part instep 3503. The BS may transmit a downlink control channel and datachannel in step 3504.

Next, the UE procedure will be described with reference to FIG. 35B.

The UE decodes the downlink control channel and obtains DCI in step3511.

The UE may obtain resource allocation information of the downlink datachannel from the DCI in step 3512. Further, the UE may obtaininformation on the data start point for each data part in step 3513.

The UE may decode the scheduled downlink data channel on the basis ofthe obtained resource allocation information and information on the datastart point in step 3514.

Embodiment 3-3

FIG. 36 illustrates an example of a method of sharing resources betweenthe data channel and the control channel according to embodiment 3-3 ofthe disclosure.

More specifically, FIG. 36 illustrates an example in which two controlregions, that is, control region #1 3640 and control region n #2 3650,are configured within time and frequency resources including a systembandwidth 3610 on the frequency axis and one slot 3620 on the time axis.

In FIG. 36, a control region length of control region #1 3640 isconfigured as control region length #1 3660 and a control region lengthof control region #2 3650 is configured as control region length #23670. In the example of FIG. 36, some parts of a PDSCH 3601 may bescheduled through predetermined resources within the system band 3610.

In scheduling of the PDSCH 3601, resource allocation may be performedusing various resource-sharing methods according to embodiment 3-1 inconsideration of resource regions 3640 and 3650 configured within thesystem. Accordingly, parts of the PDSCH 3601 may have different startpoints depending on the allocated frequency location and whetherresources of the control region are reused.

The data start point at each frequency location to which the PDSCH 3601is allocated may be semi-statically configured in embodiment 3-3 of thedisclosure. In a more detailed description made with reference to thedrawing, the entire system bandwidth 3610 may be partitioned into aplurality of bandwidth parts. In the example of FIG. 36, the entiresystem bandwidth 3610 is partitioned into a total of four parts, thatis, bandwidth part #1 3602, bandwidth part #2 3603, bandwidth part #33604, and bandwidth part #4 3605. The bandwidth parts 3602, 3603, 3604,and 3605 may be semi-statically configured to have specific data startpoints, and the corresponding configuration may be indicated to the UE.

FIG. 36 illustrates an example in which the data start points inbandwidth part #1 3602 and bandwidth part #2 3603 are configured as athird OFDM symbol, the data start point in bandwidth part #3 3604 isconfigured as a first OFDM symbol, and the data start point in bandwidthpart #4 3605 is configured as a second OFDM symbol.

According to the bandwidth part 3602, 3603, 3604, or 3605 through whichthe PDSCH 3601 is transmitted via the resource allocation process, thePDSCH 3601 or a portion of the PDSCH 3601 transmitted through thecorresponding bandwidth part may be scheduled to be transmitted to thepreconfigured data start point.

For example, with respect to the parts of the scheduled PDSCH 3601transmitted through bandwidth part #1 3602 and bandwidth part #2 3603,data may be transmitted with the third OFDM symbol as the data startpoint in FIG. 36. Similarly, with respect to the part of the PDSCH 3601transmitted through bandwidth part #3 3604, data may be transmitted withthe first OFDM symbol as the data start point, and with respect to thepart transmitted through bandwidth #4 3605, data may be transmitted withthe second OFDM symbol as the data start point. As a result, the datastart points of all parts of the PDSCH 3601 transmitted in specificbandwidth parts may be data start points preconfigured in thecorresponding bandwidth parts.

In embodiment 3-3 of the disclosure, the data start points of thebandwidth parts 3602, 3603, 3604, and 3605 may be determined on thebasis of configuration information of the control regions 3640 and 3605existing within the system. More specifically, it is determined whetherthere is a control region within a specific bandwidth part, and if thereis such a control region, a (control region length+1)^(th) symbol of thecorresponding control region may be configured as n the data start pointin the corresponding bandwidth part. For example, in FIG. 36, controlregion #1 3640 may exist in bandwidth part #2 3603, and accordingly, adata start point in bandwidth part #2 3603 may be configured as a thirdsymbol which is a (control region length #1 3660+1)^(th) symbol.

In another example, since there is no control region in bandwidth part#3 3604, a data start point may be configured as a first OFDM symbol inFIG. 36.

Further, each UE may not receive an indicator of the data start point inthe specific bandwidth part according to control region configurationinformation configured for the UE. For example, if it is assumed thatcontrol region #1 3640 is configured to UE #1 in FIG. 36, the UE alreadyknows the frequency axis location of control region #1 3640 andinformation on control region length #1 3660. Accordingly, the BS mayomit the transmission of indicators for the data start points in thebandwidth parts (bandwidth part #1 3602 and bandwidth part #2 3603) inwhich control region #1 3640 is configured to UE #1.

UE #1 may implicitly be aware of configuration information of the datastart points in bandwidth part #1 3602 and bandwidth part #2 3603 fromconfiguration information of control region #1 3640.

A value appointed by a system parameter may be used as partitioningconfiguration information of the system bandwidth 3610 (for example, thenumber of bandwidth parts and the bandwidth of the bandwidth part).Alternatively, the partitioning configuration information may beimplicitly determined by other system parameters, for example, a systembandwidth, the number of configured resource regions, resource regionconfiguration information, and whether carriers are aggregated.Alternatively, the partitioning configuration information may beprovided to the UE through an MIB or an SIB as cell-common systeminformation.

Alternatively, the partitioning configuration information may besemi-statically configured to the UE through higher-layer signaling, forexample, RRC signaling and MAC CE signaling.

The indicators of the data start points in the bandwidth parts 3602,3603, 3604, and 3605 may be transmitted to the UE through higher-layersignaling, for example, RRC signaling or MAC CE signaling.

Embodiment 3-3 of the disclosure may include an operation for indicatingone data start point for one PDSCH 3601. For example, if the number ofbandwidth parts is configured as one, one indicator may be transmittedor semi-statically configured for the data start point.

In 5G, the sizes of the system bandwidth and the maximum bandwidth thatthe UE can support may be different from each other. Accordingly, allprocedures operating on the basis of the system bandwidth may bereplaced with the bandwidth (for example, UE bandwidth) supported by theUE and equally applied.

FIGS. 37A and 37B illustrate BS and UE operations according toembodiment 3-3 of the disclosure.

First, the BS procedure will be described with reference to FIG. 37A.

The BS may transmit configuration information of bandwidth parts in step3701 and transmit information on a data start point in each bandwidthpart in step 3702.

The BS performs resource allocation for a downlink control channel instep 3703. The BS may perform resource allocation for a data channel instep 3704.

At this time, the BS may perform resource allocation for a data channelon the basis of the method of sharing resources between the data channeland the control channel according to embodiment 3-3 of the disclosure.That is, scheduling may be performed by applying the preconfigured datastart point according to the frequency region to which the data channelis allocated.

The BS may perform transmission for the downlink control channel and thedata channel in step 3705.

Next, the UE procedure will be described with reference to FIG. 37B. TheUE may receive configuration information of bandwidth parts in step3711.

The UE may receive information on a data start point for each bandwidthpart in step 3712.

The UE decodes the downlink control channel and obtains DCI in step3713.

The UE may obtain resource allocation information for the downlink datachannel from the DCI in step 3714 and apply the preconfigured data startpoint to the downlink data channel in each bandwidth part in step 3715.

The UE may decode the scheduled downlink data channel in step 3716.

Embodiment 3-3-1

In embodiment 3-3-1 of the disclosure, through a method ofsemi-statically configuring a data start point at each frequencylocation to which the PDSCH is allocated, all (or some required) piecesof control region configuration information within the system may beindicated to the UE. More specifically, control region of UE #1 may beconfigured as control region n #1 3640 in FIG. 36, and thus UE #1 may beaware of time and frequency resource information for control region #13640. However, UE #1 does not receive the configuration for controlregion #2 3650 and thus is not aware whether control region #2 3650exists within the system bandwidth 3610. At this time, in order tosemi-statically configure the data start point at the frequency locationto which the PDSCH 3601 is allocated, configuration information forcontrol region #2 3650 may be provided to UE That is, UE #1 may applythe corresponding data start point according to the frequency locationat which the PDSCH 3601 is transmitted on the basis of configurationinformation for all control regions existing within the system, such ascontrol region #1 3640 and control region #2 3650.

Embodiment 3-3-2

In embodiment 3-3-2 of the disclosure, through the method of sharingresources between the data channel and the control channel according toembodiment 3-3 of the disclosure, semi-static signaling for the datastart point may be turned on/off using various methods. The on/offoperation may be applied to the entire system bandwidth 3610 or to aspecific bandwidth part 3602, 3603, 3604, or 3605. The on/off operationmay be dynamically configured through DCI or may be semi-staticallyconfigured through higher-layer signaling (for example, RRC signaling orMAC CE signaling).

Embodiment 3-4

FIG. 38 illustrates an example of a method of sharing resources betweenthe data channel and the control channel according to embodiment 3-4 ofthe disclosure.

More specifically, FIG. 38 illustrates an example in which two controlregions, such as control region #1 3840 and control region #2 3850, areconfigured within time and frequency resources including a systembandwidth 3810 on the frequency axis and one slot 3820 on the time axis.

In FIG. 38, a control region length of control region #1 3840 isconfigured as control region length #1 3860 and a control region lengthof control region #2 3850 is configured as control region length #23870.

In the example of FIG. 38, some parts of a PDSCH 3801 may be scheduledthrough predetermined resources within the system band 3810. Inscheduling of the PDSCH 3801, resource allocation may be performed usingvarious resource-sharing methods according to embodiment 3-1 toembodiment 3-3 in consideration of resource regions 3840 and 3850configured within the system. Accordingly, parts of the PDSCH 3801 mayhave different start points according to the allocated frequencylocation and whether resources of the control region are reused.

The data start point at each frequency location to which the PDSCH 3801is allocated may be semi-statically and dynamically configured inembodiment 3-4 of the disclosure. The entire system bandwidth 2810 maybe partitioned into a plurality of bandwidth parts, and a data startpoint in each bandwidth part may be semi-statically configured. Further,some bandwidth parts may be configured to dynamically receive the datastart points.

In a more detailed description made with reference to the drawing, theentire system bandwidth 3810 is partitioned into a total of fourbandwidth parts, that is, bandwidth part #1 3802, bandwidth part #23803, bandwidth part #3 3804, and bandwidth part #4 3805 in the exampleof FIG. 38.

The bandwidth parts 3802, 3803, 3804, and 3805 may be semi-staticallyconfigured to have specific data start points, and the correspondingconfiguration matter may be indicated to the UE. As described in theembodiments of the disclosure, the semi-statically configured data startpoints may be configured in consideration of the length of the resourceregion depending on whether there is a resource region within thecorresponding bandwidth part.

For example, in FIG. 38, the semi-static data start points in bandwidthpart #1 3802 and bandwidth part #2 3803 may be configured as a thirdOFDM symbol 3808 in consideration of control region length #1 3840 ofcontrol region #1 3840 existing in the corresponding bandwidth part. Thedata start point in bandwidth part #3 3804 may be configured as a firstOFDM symbol, and the data start point in bandwidth part #4 3805 may beconfigured as a second OFDM symbol.

Some of the bandwidth parts may be additionally configured to supportdynamic indicators for the data start points in embodiment 3-4 of thedisclosure.

In the example of FIG. 38, bandwidth part #1 3802 and bandwidth part #23803 are configured to support dynamic indicators for data start points.

In the case of the PDSCH 3801 transmitted in bandwidth part #1 3802 orbandwidth part #2 3803, information on data start points may bedynamically indicated. In a more detailed example, the semi-static datastart point of bandwidth part #2 3803 may be configured as a third OFDMsymbol 3808, as assumed above. If bandwidth part #2 3803 is configuredto support the dynamic data start point indicator, as indicated byreference numeral 3806, resource allocation may be freely performed forthe PDSCH 3801 in the corresponding bandwidth part in consideration ofresource reuse in resource region #1 3840. For example, the start pointof the PDSCH 3801 may be dynamically scheduled to a second OFDM symbol3809 in bandwidth part #2 3803, and the BS may additionally transmit theindicator for the data start point in bandwidth part #2 3803 throughDCI.

Information on whether a dynamic indicator for a data start point issupported in a specific bandwidth part may be transmitted to the UEthrough higher-layer signaling, for example, RRC signaling or MAC CEsignaling. Alternatively, the information may be implicitly provided onthe basis of configuration information of the resource region. Forexample, if control region #1 3840 is configured for UE #1 in FIG. 38,bandwidth part #1 3802 and bandwidth part #2 3803, which are bandwidthparts in which control region #1 3840 exists, may be implicitlyconfigured to transmit the dynamic indicator. If the PDSCH 3801 of UE #1is transmitted, efficiency of resource use may increase through the moreactive use of resource sharing in control region #1 3840, since time andfrequency resource information of control region #1 3840 is alreadyknown to UE #1. Accordingly, in order to support the resource sharing,it is preferable to configure dynamic indicators for data start pointsin bandwidth part #1 3802 and bandwidth part #2 3803.

If the dynamic indicator is transmitted in the bandwidth part configuredto transmit the dynamic indicator, the UE may determine the data startpoint by ignoring the preconfigured semi-static indicator andpreferentially applying the dynamic indicator.

Even in the bandwidth part configured to transmit the dynamic indicator,the dynamic indicator may be transmitted only when the dynamic indicatoris necessary. For example, if the data start point indicated by thedynamic indicator is the same as the data start point indicated by thesemi-static indicator, the dynamic indicator may not be transmitted. Inthis case, the UE may determine the data start point by directlyapplying the preconfigured semi-static indicator. At this time, anadditional field indicating whether to transmit the dynamic indicatormay be included in DCI, and a number of bits corresponding to some orall of the dynamically configured bandwidth may be needed. If thedynamic indicator is not transmitted, unused DCI bits may be reserved ormay be used for another purpose.

Embodiment 3-4 of the disclosure may include an operation for indicatingone data start point for one PDSCH 3801. For example, if the number ofbandwidth parts is configured as one, one indicator may be dynamicallyor semi-statically configured for the data start point.

FIGS. 39A and 39B illustrate BS and UE operations according toembodiment 3-4 of the disclosure.

First, the BS procedure will be described with reference to FIG. 39A.

The BS may transmit configuration information on the bandwidth part instep 3901 and transmit semi-static data start point information in eachbandwidth part in step 3902.

The BS may configure a specific bandwidth to transmit the dynamicindicator for the data start point and transmit configurationinformation thereof to the UE in step 3903.

The BS performs resource allocation for a downlink control channel instep 3904.

The BS may perform resource allocation for a data channel in step 3905.At this time, the BS may perform resource allocation for a data channelon the basis of the method of sharing resources between the data channeland the control channel according to embodiment 3-4 of the disclosure.That is, the BS may perform scheduling by applying different data startpoints according to the frequency region to which the data channel isallocated. If the frequency location for scheduling of the data channelbelongs to the bandwidth part for transmitting the semi-static indicatorfor the data start point, the data channel may be scheduled according tothe preconfigured semi-static data start point. If the frequencylocation for scheduling of the data channel belongs to the bandwidthpart for transmitting the dynamic indicator for the data start point,the data channel may be scheduled to various data start points accordingto determination of the BS.

The BS determines whether the frequency band to which the data channelsor some of the data channels are scheduled is a bandwidth partconfigured to transmit the dynamic indicator in step 3906. If thecorresponding bandwidth part is configured to transmit the dynamicindicator, the BS may additionally transmit the data start pointindicator for the corresponding bandwidth part in step 3907. The BS maytransmit a downlink control channel and a data channel in step 3908.

Next, the UE procedure will be described with reference to FIG. 39B.

The UE may receive configuration information on bandwidth parts in step3911. The UE may receive semi-static data start point information foreach bandwidth part in step 3912.

The UE may receive configuration information of a specific bandwidthpart in which the dynamic indicator for the data start point istransmitted in step 3913.

The UE may obtain DCI after decoding the downlink control channel instep 3914. The UE may obtain resource allocation information of thedownlink data channel from DCI in step 3915.

The UE determines whether the frequency band to which the data channelsor some of the data channels are scheduled is the bandwidth partconfigured to transmit the dynamic indicator in step 3916. If thecorresponding bandwidth is configured to transmit the dynamic indicator,the UE may dynamically obtain the data start point indicator for thecorresponding bandwidth from DCI in step 3917. If the correspondingbandwidth part is not configured to transmit the dynamic indicator, theUE may apply the data start point for the corresponding bandwidth partas the preconfigured semi-static data start point in step 3918.

If determination of the data start point is completed, the UE may decodethe data channel in step 3919.

Embodiment 3-4-1

The BS may indicate all pieces of control region configurationinformation (or a required portion thereof) within the system to the UEthrough the method of configuring the data start point at each frequencylocation to which the PDSCH is allocated in embodiment 3-4-1 of thedisclosure. More specifically, the BS may inform UE #1 of configurationinformation of control region #1 3840 and control region #2 3850, thatis, time and frequency resource information, in FIG. 38. In this case,transmission of the dynamic/semi-static indicator for the data startpoint may be configured for each resource region, rather than thebandwidth part. For example, resource region #1 3840 may be configuredto transmit the dynamic indicator and resource region #2 3850 may beconfigured to transmit the semi-static indicator. As a result, in alloperations of embodiment 3-4, the bandwidth parts may be displaced foreach resource region and applied equally.

Embodiment 3-4-2

In embodiment 3-4-2 of the disclosure, embodiment 3-2 of the disclosuremay be applied to the bandwidth part configured through dynamicsignaling for the data start point through the method of sharingresources between the data channel and the control channel according toembodiment 3-4 of the disclosure.

For example, embodiment 3-2 may be applied to some of the PDSCHs 3801transmitted in bandwidth part #2 3803, configured to transmit thedynamic indicator in FIGS. 39A and 39B. That is, some of the PDSCHs 3801transmitted in bandwidth part #2 3803 may be partitioned IQ into dataparts, and a plurality of data start point indicators corresponding tothe data parts may be transmitted. Through embodiments of thedisclosure, it is possible to increase the efficiency of reuse ofresources for resource region #1 3860 existing in bandwidth part #23803.

Embodiment 3-4-3

In embodiment 3-4-3 of the disclosure, semi-static/dynamic signaling forthe data start point may be turned on/off in various ways in the methodof sharing resources between the data channel and the control channelaccording to embodiment 3-4 of the disclosure. The on/off operation maybe applied to the entire system bandwidth 3810 or a specific bandwidthpart 3802, 3803, 3804, or 3805. Alternatively, the on/off operation maybe applied to the dynamically configured bandwidth parts 3802 and 3803or to the statically configured bandwidth parts 3804 and 3805. Theon/off operation may be dynamically configured through DCI or may besemi-statically configured through higher-layer signaling (for example,RRC signaling or MAC CE signaling).

Embodiment 3-5

FIG. 40 illustrates an example of a method of sharing resources betweenthe data channel and the control channel according to embodiment 3-5 ofthe disclosure. In embodiment 3-5 of the disclosure, a plurality of UEsexists in the system, a plurality of resource regions are configured,and a data channel of a specific UE is transmitted. FIG. 40 illustratesone of the available examples that can be generally expressed.

More specifically, FIG. 40 illustrates an example in which two controlregions, that is, control region #1 4010 and control region #2 4050, areconfigured within time and frequency resources including a systembandwidth 4040 on the frequency axis and one slot 4020 on the time axis.

In FIG. 40, a control region length of control region #1 4040 isconfigured as control region length #1 4060 and a control region lengthof control region #2 4050 is configured as control region length #24070.

In the description of the disclosure made with reference to FIG. 40, itis assumed that control region #1 4040 is configured to UE #1 and thatcontrol region #1 4040 and control region #2 4050 are configured toanother UE, for example, UE #2. Further, it is assumed that DCI #1 4002,corresponding to a control signal for UE #1, is transmitted in controlregion #1 4030 and that DCI #2 4003, corresponding to a control signalfor UE #2, is transmitted in control region #1 3340 and control region#2 3350 in FIG. 40.

In control region #1 4040 and control region #2 4050, resources 4002that are not used for transmission of DCI #1 4003 and DCI #2 4004 mayexist. In addition, it is assumed that PDSCH #1 4001 corresponding to adata channel for UE #1 is transmitted in FIG. 40. FIG. 40 is only anexample for convenience of description of the disclosure, and it isnoted that FIG. 33 does not limit the disclosure to a specificsituation. The disclosure may be equally applied to various transmissionenvironments through slight modification thereof without departing fromthe scope of the disclosure.

In embodiment 3-5 of the disclosure, more flexible resource sharingbetween the data channel and the control channel in a specific resourceregion existing in the system may be supported with relatively lowsignaling overhead. In embodiment 3-5 of the disclosure, a specificresource region may be partitioned into a plurality of resource regionparts (control resource set parts), and whether DCI of another UE istransmitted in each resource region part may be indicated.

In a resource region part in which DCI of another UE is not transmitted,the data channel may be scheduled from a first OFDM symbol. In aresource region part in which DCI of another UE is transmitted, a datastart point may not be the first OFDM symbol, and, for example, a(resource region length+1)^(th) symbol of the corresponding resourceregion may be the data start point. As a result, the data channel mayhave one or a plurality of data start points depending on the scheduledfrequency location.

This will be described in more detail with reference to the drawings.FIG. 40 illustrates an example in which PDSCH #1 4001 of UE #1 isscheduled and transmitted in a frequency region in which resource region#1 4040 is configured. UE #1 may be made aware in advance ofconfiguration information of resource region #1 4040 and thus may beaware of a frequency location of resource region #1 4040 and informationon resource region length #1 4060. Further, DCI #1 4002 of UE #1 may betransmitted through specific resources of resource region #1 4040 and UE#1 may obtain transmission resources of DCI #1 through blind decoding.

According to embodiment 3-5 of the disclosure, resource region #1 4040may be partitioned into a plurality of resource region parts, forexample, resource region part #1 4041, resource region part #2 4042, andresource region part #3 4043. Whether DCI of another UE is transmittedin each resource region part 4041, 4042, or 4043 may be provided to theUE through, for example, 1 bit (or a plurality of bits).

Since only DCI #1 4002 of UE #1 is transmitted in resource region part#1 4041 in the example of FIG. 40, the BS may inform UE #1 that there isno transmission of DCI of another UE. Further, since DCI #2 4003 of UE#2 is transmitted in resource region part #2 4042 and resource regionpart #3 4043, the BS may inform UE #1 that DCI of another UE istransmitted. UE #1 may determine the data start point on the basis of anindicator indicating whether DCI for another UE transmitted in eachresource region part is transmitted. For example, in the example of FIG.40, the UE is aware of information indicating that there is notransmission of DCI of another UE, so that it may be assumed that aportion of PDSCH #1 4001 transmitted at the frequency location ofresource region part #1 4041 is the data start point from a first OFDMsymbol. At this time, UE #1 is aware of transmission resources of DCI #14001 and thus may know that the portion of PDSCH #1 4001 in resourceregion part #1 4041 is rate-matched and perform decoding on the basis ofthe information.

Meanwhile, since the UE receives the information indicating that DCI ofanother UE is transmitted in resource region part #2 4042 and resourceregion part #3 4043, different data start points may be applied to theportion of PDSCH #1 4001 transmitted at the frequency location ofresource region part #2 4042 and resource region part #3 4043. Forexample, UE #1 knows in advance information on resource region length #14060, so that it may be assumed that the data start point of the portionof PDSCH #1 4001 transmitted in resource region part #2 4042 andresource region part #3 4043 is a (resource region length #14060+1)^(t)h OFDM symbol.

In embodiment 3-5 of the disclosure, a value appointed as a systemparameter may be used for configuration information of the resourceregion parts (for example, the number of resource region parts).Alternatively, the configuration information may be implicitlydetermined by other system parameters, for example, a system bandwidth,the configured number of resource regions, and configuration informationof the resource region (frequency bandwidth of the resource region andresource region length). Alternatively, the configuration informationmay be provided to the UE through an MIB or an SIB as cell-common systeminformation. Alternatively, the configuration information may besemi-statically configured to the UE through higher-layer signaling, forexample, RRC signaling and MAC CE signaling. Information on whether DCIof another UE is transmitted in each resource region part 4041, 4042, or4043 may be transmitted to the UE through DCI.

In embodiment 3-5 of the disclosure, signaling indicating whether DCI ofanother UE transmitted in each resource region part is transmitted maybe replaced with signaling indicating an actual data start point. Inthis case, the resource region may be more efficiently reused butsignaling overhead may increase. Further, the data start point accordingto whether the DCI is transmitted may be partitioned into, for example,a first data start point and a second data start 2.5 point, and a valuefor each data start point may be semi-statically configured, or a fixedvalue may be used therefor.

In embodiment 3-5 of the disclosure, a specific resource region to whichembodiment 3-5 is applied may be additionally configured. For example,the indicator indicating whether the DCI of another UE is transmittedmay be transmitted not only to the resource region preconfigured to aspecific UE but also to other resource regions.

For example, in FIG. 40, resource region #2 4050 may also be configuredto apply embodiment 3-5, and to this end, configuration information ofresource region #2 4050 may be provided in advance to UE #1.

In embodiment 3-5 of the disclosure, the data start point may bedetermined in the bandwidth part in which there is a non-configuredresource region for the UE within the system through various embodimentsof the disclosure, for example, a combination of embodiment 3-2,embodiment 3-3, and embodiment 3-4.

FIGS. 41A and 41B illustrate BS and UE operations according toembodiment 3-5 of the disclosure.

First, the BS procedure will be described.

The BS may transmit configuration information on resource region partsof a specific resource region to the UE in step 4101.

The BS may perform resource allocation on the downlink control channelin step 4102. The BS may transmit an indicator indicating whether DCI ofanother UE is transmitted in each resource region part in step 4103.

The BS may perform resource allocation on the downlink data channel instep 4103. At this time, the BS may perform resource allocation on thedata channel on the basis of the method of sharing resources between thedata channel and the control channel according to embodiment 3-5 of thedisclosure. That is, the BS may perform scheduling by applying differentdata start points according to the resource region part in which thedata channel is transmitted and whether DCI of another UE is transmittedin the corresponding resource region part. For example, the BS may applya first data start point to a resource region part in which there is notransmission of DCI of another UE and a second data start point to aresource region part in which there is transmission of DCI of anotherUE.

The BS may transmit the downlink control channel and data channel instep 4105.

Next, the UE procedure will be described.

The UE may receive configuration information on resource region parts ofa specific resource region in step 4111. The UE may obtain DCI afterdecoding the downlink control channel in step 4112. The UE may obtainresource allocation information of the downlink data channel in step4113.

The UE may obtain information on whether DCI of another UE istransmitted in each resource region part in step 4114.

The UE may determine whether DCI of another UE is transmitted in aresource region part corresponding to a frequency location at which thedata channel is scheduled in step 4115.

If DCI of another UE is not transmitted in the corresponding resourceregion part, the first data start part may be applied to the datachannel or the data channel part at the corresponding location. If DCIof another UE is transmitted in the corresponding resource region part,the second data start part may be applied to the data channel or thedata channel part at the corresponding location.

The UE may decode the downlink data channel on the basis of finallyobtained scheduling information in step 4118.

Embodiment 3-6

Embodiment 3-6 of the disclosure provides an implicit signaling methodof efficiently sharing resources between the data channel and thecontrol channel. The UE may implicitly determine a data start point invarious ways. For example, information such as transmission typeconfiguration information of the resource region (localized-typetransmission or distributed-type transmission), resource-mapping typeconfiguration information of the resource region (frequency-firstmapping or time-first mapping), an aggregation level supported in theresource region (for example, whether a higher aggregation level issupported), and search space configuration information of the resourceregion (common search space or UE-specific search space) may be used toimplicitly provide the data start point.

For example, if any resource region is configured in the distributedmapping type, resource sharing between the data channel and the controlchannel in the corresponding resource region may be applied with a verylow probability. Accordingly, between the BS and the UE, it is efficientto promise not to share resources in the resource region configured inthe distributed mapping type in the system. Accordingly, if the datachannel of the UE is scheduled to the same frequency location as theresource region configured in the distributed mapping type, the UE mayimplicitly know that the data start point at the corresponding frequencylocation is a (resource region length+1)^(th) symbol.

The data start point described above may be analyzed to be the same asthe indicator indicating whether the data channel is rate-matched in themethod of sharing resources between the data channel and the controlchannel. For example, it is assumed that a control region (controlresource set (CORESET), resource region) is configured as OFDM symbolsfrom a first OFDM symbol to an n^(th) OFDM symbol through the controlchannel and is allocated to a specific frequency band. Indicating ann+1^(th) symbol as the data start point for the data channel transmittedthrough the corresponding frequency band means that no data channel istransmitted in the corresponding control region, which means that thePDSCH is rate-matched for the corresponding control region andtransmitted.

Alternatively, indicating the first OFDM symbol as the data start pointfor the data channel transmitted in the frequency band configured as thecontrol region means that the data channel is transmitted in thecorresponding control region, which means that the PDSCH is transmittedwithout rate-matching for the corresponding control region.

That is, information on whether rate matching for the PDSCH in thecorresponding control region is performed may be indicated by 1 bit,which may be analyzed to be the same as the indicator indicating thedata start point of the first OFDM symbol or the n+1^(th) OFDM symbol.

The method of sharing resources between the data channel and the controlchannel and various signaling methods of efficiently supporting the samehave been described in connection with various embodiments of thedisclosure. One or a plurality of embodiments of the disclosure may beused independently or a combination thereof may be used in one system.

For example, through a combination of embodiment 3-3 of the disclosureand embodiment 3-5 of the disclosure, embodiment 3-5 may be applied tothe configured control region and embodiment 3-2 may be applied tobandwidth parts in which a non-configured control region exists.Embodiments of the disclosure are presented only for specific examplesto easily describe the technology of the disclosure and helpunderstanding of the disclosure, and do not limit the scope of thedisclosure. That is, it is obvious to those skilled in the art to whichthe disclosure belongs that different modifications can be achievedbased on the technical spirit of the disclosure. Further, if necessary,the above respective embodiments may be employed in combination.

Embodiment 3-7

Embodiment 3-7 of the disclosure provides a method of efficientlysharing resources between the data channel and the control channel.

The BS may inform the UE of time and frequency resources for one or aplurality of control regions (control resource set (CORESET), resourceregion) in which the corresponding UE receives the downlink controlchannel through higher-layer signaling, for example, RRC signaling.

For example, in FIG. 40, the BS may inform UE #1 of configurationinformation of control region #1 4040 (for example, time and frequencyresources) and UE #1 may receive its own downlink control informationfrom control region #1 4040.

The control region of the UE is called a “first control region” forconvenience of description of the disclosure.

If the BS transmits a PDSCH of any UE and time/frequency resources towhich the PDSCH is allocated include a portion or an entirety of the“first control region”, the PDSCH may be rate-matched and transmittedwithout being transmitted in the time/frequency resources correspondingto the “first control region”.

If the BS transmits a PDSCH of any UE and time/frequency resources towhich the PDSCH is allocated include a portion or the entirety of the“first control region”, the PDSCH may also be transmitted in thetime/frequency resources corresponding to the “first control region”without rate matching. If the time/frequency resources to which thePDSCH is allocated include a portion or the entirety of thetime/frequency resources through which DCI of the corresponding UE istransmitted, the BS may rate-match and transmit the PDSCH for thetime/frequency resources through which the corresponding DCI istransmitted.

The BS may transmit an indicator indicating whether rate matching forthe “first control region” is performed to the UE. For example, if oneor a plurality of “first control regions” are known to the UE, anindicator indicating whether to transmit the PDSCH allocated to aportion or the entirety of the corresponding “first control region”after rate matching or without rate matching may be transmitted(however, transmit the PDSCH after rate matching for time/frequencyresources through DCI of the corresponding UE is transmitted). Forexample, if N (N≥1) “first control regions” are known, the BS mayindicate the same to the UE through an N-bit indicator.

The indicator may be transmitted through higher-layer signaling (forexample, RRC signaling or MAC CE signaling), common DCI, group-commonDCI, or UE-specific DCI.

The UE may receive resource allocation information of its own PDSCH fromdownlink control information, and if time/frequency resources to whichits own PDSCH is allocated include a portion or the entirety of the“first control region”, different PDSCH-decoding operations may beperformed according to the indicator.

If the UE receives an indicator indicating that transmission isperformed after rate matching for a specific “first control region”, theUE may assume that the PDSCH is rate-matched and transmitted withoutbeing transmitted in the time/frequency resources corresponding to the“first control region” for the received PDSCH. Accordingly, the UE maydecode the PDSCH of the remaining regions except for the “first controlregion”.

If the UE receives an indicator indicating that transmission isperformed without rate matching for a specific “first control region”,the UE may assume that the PDSCH is also transmitted in thetime/frequency resources corresponding to the “first control region” forthe received PDSCH and accordingly decode the PDSCH. However, if thetime/frequency resources to which the PDSCH is allocated include aportion or the entirety of the time/frequency resources through whichthe DCI of the corresponding UE is transmitted, the UE assumes that thePDSCH is rate-matched and transmitted for the time/frequency resourcesthrough which the corresponding DCI is transmitted and accordinglydecode the PDSCH in the remaining resource regions except for the regionin which the corresponding DCI is transmitted.

The BS may additionally inform the UE of time and frequency resourcesfor one or a plurality of control regions configured to another UEexisting within the system bandwidth or the bandwidth of thecorresponding UE through higher-layer signaling, for example, RRCsignaling, common DCI, or group-common DCI.

For example, if control region #1 4040 is configured as a control regionfor UE #1 and control region #2 4050 is configured as a control regionfor UE #2 in FIG. 40, the BS may additionally inform the UE of time andfrequency resources of control region #2 4050.

For convenience of description of the disclosure, the time and frequencyresources of the control region configured for another UE may bereferred to as a “second control region”.

If the BS transmits a PDSCH of any UE and time/frequency resources towhich the PDSCH is allocated include a portion or the entirety of the“second control region”, the PDSCH may be rate-matched and transmittedwithout being transmitted in the time/frequency resources correspondingto the “second control region”.

If the BS transmits a PDSCH of any UE and time/frequency resources towhich the PDSCH is allocated include a portion or the entirety of the“second control region”, the PDSCH may also be transmitted in thetime/frequency resources corresponding to the “second control region”without rate matching.

The BS may transmit an indicator indicating whether rate matching forthe “second control region” is performed. For example, if one or aplurality of “second control regions” are known to the UE, an indicatorindicating whether to transmit the PDSCH allocated to a portion or theentirety of the “second control region” after rate matching or withoutrate matching may be transmitted. For example, if M (M≥1) “secondcontrol regions” are known, the BS may indicate an M-bit indicator tothe UE.

The indicator may be transmitted through higher-layer signaling (forexample, RRC signaling or MAC CE signaling), common DCI, group-commonDCI, or UE-specific DCI.

The UE may receive resource allocation information of its own PDSCH fromdownlink control information, and if time/frequency resources to whichits own PDSCH is allocated include a portion or the entirety of the“second control region”, different PDSCH-decoding operations may beperformed according to the indicator.

If the UE receives an indicator indicating that transmission isperformed after rate matching for a specific “second control region”,the UE may assume that the PDSCH is rate-matched and transmitted withoutbeing transmitted in the time/frequency resources corresponding to the“second control region” for the received PDSCH. Accordingly, the UE maydecode the PDSCH of the remaining regions except for the “second controlregion”.

If the UE receives an indicator indicating that transmission isperformed without rate matching for a specific “second control region”,the UE may assume that the PDSCH is also transmitted in thetime/frequency resources corresponding to the “second control region”for the received PDSCH and accordingly decode the PDSCH.

Understanding of the “first control region” and the “second controlregion” described above may be UE-specific. In the example of FIG. 40,the “first control region” of UE #1 may be control region #1 4040 andthe “first control region” of UE #2 may be control region #2 4050.Further, the “second control region” of UE #1 may be control region #24050 and the “second control region” of UE #1 may be control region #14040.

The aforementioned “second control region” may be the same as reservedresources to the corresponding UE. The UE may assume that transmissionusing the reserved resources is not possible. However, whether toactivate/deactivate the reserved resources may be indicated through theaforementioned indicator.

Embodiment 3-7-1

If there is one or a plurality of control regions within the system bandor the UE band, information on whether time/frequency resourcesconfigured as the corresponding control region may be used for PDSCHtransmission (or whether rate matching of the PDSCH in the correspondingresource region is equally performed) may be provided to the UE. The BSmay inform one or a plurality of UEs of the information through DCI orgroup-common DCI. For example, if L (L≥1) control regions are known, theBS may indicate the same to the UE through an L-bit indicator.

For example, as in the example of FIG. 40, if two control regions, thatis, control region #1 4040 and control region #2 4050, exist within thesystem bandwidth and UE #1 and UE #2 receive the same common DCI orgroup-common DCI, the BS may inform UE #1 and UE #2 of whethertime/frequency resources to which each control region is allocated canbe used for PDSCH transmission through higher-layer signaling (forexample, RRC signaling or MAC CE signaling), common DCI, or group-commonDCI.

The UE may receive the indicator through higher-layer signaling, commonDCI, or group-common DCI and may obtain information on whether the PDSCHis rate-matched for time/frequency resources configured as each controlregion existing within the system band or the UE band. When receivingits own PDSCH, the UE may receive and decode the PDSCH in considerationof rate matching for the control region on the basis of the information.

Embodiment 3-7-2

If there is one or a plurality of control regions within the system bandor the UE band, information on whether time/frequency resourcesconfigured as the corresponding control region may be used for PDSCHtransmission (or whether rate matching of the PDSCH in the correspondingresource region is performed) may be provided to the UE. The BS mayinform one or a plurality of UEs of the information through higher-layersignaling (for example, RRC signaling or MAC CE signaling), common DCI,or group-common DCI. For example, if L (L≥1) control regions are known,the BS may indicate the same to the UE through an L-bit indicator.

For example, as in the example of FIG. 40, if two control regions, thatis, control region #1 4040 and control region #2 4050, exist within thesystem bandwidth and UE #1 and UE #2 receive the same common DCI orgroup-common DCI, the BS may inform UE #1 and UE #2 of whethertime/frequency resources to which each control region is allocated canbe used for PDSCH transmission through higher-layer signaling (forexample, RRC signaling or MAC CE signaling), common DCI, or group-commonDCI.

The indicator may be referred to as a first indicator.

Further, the BS may additionally inform the specific UE of whether thetime/frequency resources configured as the “first control region” of thecorresponding UE can be used for PDSCH transmission (or whether ratematching of the PDSCH in the corresponding resource region is equallyperformed). The BS may transmit the information to each UE throughUE-specific DCI.

For example, in the example of FIG. 40, if the “first control region” ofUE #1 is control region #1 4040 and the “first control region” of UE #2is control region #2 4050, the BS may transmit an indicator indicatingwhether time/frequency resources of control region #1 4040 can be usedfor PDSCH transmission (or whether rate matching of the PDSCH in thecorresponding resource region is equally performed) to UE #1 throughUE-specific DCI and transmit an indicator indicating whethertime/frequency resources of control region #2 4050 can be used for PDSCHtransmission (or whether rate matching of the PDSCH in the correspondingresource region is equally performed) to UE #2 through UE-specific DCI.

The indicator may be referred to as a second indicator.

The BS may transmit the first indicator to the UE, transmit the secondindicator to the UE, or transmit both the first indicator and the secondindicator to the UE.

The UE may receive the first indicator from the BS, receive the secondindicator from the BS, or receive both the first indicator and thesecond indicator from the BS.

The UE may receive the first indicator from the BS through higher-layersignaling, common DCI, or group-common DCI and may obtain information onwhether the PDSCH is rate-matched for time/frequency resourcesconfigured as each control region existing within the system band or theUE band. Upon receiving its own PDSCH, the UE may receive and decode thePDSCH in consideration of rate matching for the control region on thebasis of the information.

The UE may receive the second indicator from the BS through UE-specificDCI and obtain information on whether the PDSCH is rate-matched fortime/frequency resources configured as the first control region. Uponreceiving its own PDSCH, the UE may receive and decode the PDSCH inconsideration of rate matching of the PDSCH for the control regionconfigured as the first control region on the basis of the information.

The UE may receive both the first indicator and the second indicatorfrom the BS.

The UE may obtain information on whether the PDSCH is rate-matched foreach control region existing within the system band or the UE band. TheUE may obtain information on whether PDSCH is rate-matched for the[first control region] from the second indicator.

At this time, the UE may determine whether the PDSCH is rate-matched forthe control region corresponding to the first control region of thecorresponding UE among the control regions existing within the systemaccording to the second indicator. That is, if the UE receives both thefirst indicator and the second indicator, the UE may determine whetherto rate-match the PDSCH for the first control region according to thesecond indicator.

This will be described in detail with reference to FIG. 40. In FIG. 40,UE #1 may receive information indicating that time/frequency resourceregions configured as control region #1 4040 and control region #2 4050cannot be used for PDSCH transmission (that is, rate-matching isperformed for PDSCH transmission in the corresponding resource region)through the first indicator.

Further, UE #1 may receive information indicating that time/frequencyresource region configured as control region #1 4040, which is the firstcontrol region of UE #1, can be used for PDSCH transmission (that is,rate-matching is not performed for PDSCH transmission in thecorresponding resource region) through the second indicator.

In this case, indicators indicating PDSCH rate matching of controlregion #1 4040 are different, and at this time, the UE may receive anddecode the PDSCH according to information on the second indicatorwithout PDSCH rate matching for control region #1 4040.

Embodiment 3-7-3

The BS may transmit the second indicator for the first resource regionto the UE.

The BS may inform the UE of the time/frequency resource region for thesecond resource region through higher-layer signaling, for example, RRCsignaling. If PDSCH transmission resources overlap the resource regionconfigured as the second resource region in PDSCH transmission to thecorresponding UE, the BS may transmit the PDSCH after rate matching ofthe PDSCH for the corresponding region.

The UE may receive the second indicator from the BS and thus may knowwhether the PDSCH is rate-matched for the first resource region andreceive and decode the PDSCH according thereto. The UE may receive thetime/frequency region for the second resource region from the BS throughhigher-layer signaling (for example, RRC signaling), and may assume thatthe PDSCH is always rate-matched in the second resource region andreceive and decode the PDSCH according thereto.

Embodiment 3-8

Embodiment 3-8 of the disclosure provides a method of mapping data tothe data channel if the various methods of sharing resources between thedata channel and the control channel are applied. As described above,one data channel may have a plurality of data start points according tothe allocated frequency location through the method of sharing resourcesbetween the data channel and the control channel. At this time, themethod of mapping the data to the data channel may consider thefollowing alternatives.

[Method #1]

Data may be sequentially mapped from a first OFDM symbol in a timesequence regardless of data start points of respective parts of the datachannel. At this time, the data mapping may be performed within eachOFDM symbol in a frequency-first type.

[Method #2]

Data may be sequentially mapped from the lowest or highest frequencylocation in consideration of data start points of respective parts ofthe data channel and frequency allocation information. At this time, thedata mapping may be performed within each frequency region in afrequency-first manner or a time-first manner.

Embodiment 3-9

Embodiment 3-9 of the disclosure describes a method of performing ratematching of the data channel when the various methods of sharingresources between the data channel and the control channel are applied.

When performing resource allocation on the PDSCH of any UE, the BS mayperform transmission while reusing and allocating time/frequencyresources configured as the control region (CORESET) of thecorresponding UE. At this time, the entirety or a portion of thetime/frequency region to which the PDSCH is allocated may overlaptime/frequency resources to which DCI of the corresponding UE is mapped.As described above, if PDSCH transmission resources overlap DCItransmission resources, the BS and the UE may perform the followingoperation.

[Operation #1]

When performing resource allocation on the PDSCH, if the resources fortransmitting the PDSCH overlap the resources for transmitting DCI and ifthe corresponding DCI is DCI including scheduling information of thecorresponding PDSCH, the BS may allocate and transmit resources byrate-matching the PDSCH for the overlapping transmission resources.

The UE may obtain the DCI by performing blind decoding on the PDCCH andthus obtain scheduling information of the corresponding PDSCH. At thistime, if the received PDSCH transmission resources overlap the DCItransmission resources and if the corresponding DCI is DCI includingscheduling information of the corresponding PDSCH, the UE may receivethe PDSCH based on the assumption of rate-matching of the PDSCH for theoverlapping transmission resources and subsequently perform the decodingoperation.

[Operation #2]

When performing resource allocation on the PDSCH, if the resources fortransmitting the PDSCH overlap the resources for transmitting DCI and ifthe corresponding DCI is DCI including scheduling information of thecorresponding PDSCH, the BS may allocate and transmit resources bypuncturing the PDSCH for the overlapping transmission resources.

The UE may obtain the DCI by performing blind decoding on the PDCCH andthus obtain scheduling information of the corresponding PDSCH. At thistime, if the received PDSCH transmission resources overlap the DCItransmission resources and if the corresponding DCI is not DCI includingscheduling information of the corresponding PDSCH, the UE may receivethe PDSCH based on the assumption of puncturing of the PDSCH for theoverlapping transmission resources and subsequently perform the decodingoperation.

A transmitter, a receiver, and a controller of each of the UE and the BSare illustrated in FIGS. 42 and 43 to implement the embodiments of thedisclosure. The method of sharing resources between the data channel andthe control channel in the 5G communication system corresponding to theembodiments, the method of designating the data start point, and thestructure of the BS and the UE for performing various kinds of signalingtherefor have been described, and in order to perform the methods, eachof transmitters, receivers, and processors of the BS and the UE shouldoperate according to the embodiments.

FIG. 42 is a block diagram illustrating the internal structure of a UEaccording to an embodiment of the disclosure.

As illustrated in FIG. 42, the UE according to the disclosure mayinclude a UE processor 4201, a receiver 4202, and a transmitter 4203.

The UE processor 4201 may control a series of processes under which theUE may operate according to the embodiments of the disclosure.

For example, the UE processor 4201 may control the decoding operationfor the downlink control channel and data channel of the UE differentlydepending on information such as the method of sharing resources betweenthe data channel and the control channel, the method of configuring thedata start point, the method of configuring the resource region, themethod of configuring the bandwidth part, and the method of configuringthe resource region part according to the embodiments of the disclosure.

The UE receiver 4202 and the UE transmitter 4203 are commonly called atransceiver in the embodiments of the disclosure. The transceiver maytransmit and receive a signal to and from the BS. The signal may includecontrol information and data. To this end, the transceiver may includean RF transmitter that up-converts and amplifies the frequency of atransmitted signal and an RF receiver that low-noise amplifies areceived signal and down-converts the frequency. Also, the transceivermay receive a signal through a radio channel, output the signal to theUE processor 4201, and transmit the signal output from the UE processor4201 through the radio channel.

FIG. 43 is a block diagram illustrating the internal structure of a BSaccording to an embodiment of the disclosure.

As illustrated in FIG. 43, the BS according to the disclosure mayinclude a BS processor 4301, a receiver 4302, and a transmitter 4303.

The BS processor 4301 may control a series of processes such that the BSoperates according to the embodiments of the disclosure. For example,the BS processor 4301 may perform control differently depending on themethod of sharing resources between the data channel and the resourcechannel, the method of configuring the data start point, the method ofconfiguring the resource region, the method of configuring the bandwidthpart, and the method of configuring the resource region part accordingto the embodiments of the disclosure. Further, the BS processor 4301 mayperform control to transmit various additional indicators as necessary.

The BS receiver 4302 and the BS transmitter 4303 may be commonly calleda transceiver in the embodiments of the disclosure. The transceiver maytransmit and receive a signal to and from the terminal. The signal mayinclude control information and data. To this end, the transceiver mayinclude an RF transmitter that up-converts and amplifies the frequencyof a transmitted signal and an RF receiver that low-noise amplifies areceived signal and down-converts the frequency. Also, the transceivermay receive a signal through a radio channel, output the signal to theBS processor 4301, and transmit the signal output from the BS processor4301 through the radio channel.

Meanwhile, the sequence of description illustrated in the drawings forthe method according to the disclosure does not necessarily correspondto the execution sequence, and the sequential relationship may bechanged, or execution may be performed in parallel.

Additionally, the drawings illustrating the method of the disclosure mayomit some elements or include only some elements without departing fromthe scope of the disclosure.

Further, the method of the disclosure may be performed through acombination of some or all of the content contained in each embodimentwithout departing from the scope of the disclosure.

Meanwhile, the embodiments of the disclosure disclosed in thespecification and the drawings have been presented to easily explaintechnical contents of the disclosure and help comprehension of thedisclosure, and do not limit the scope of the disclosure. That is, it isobvious to those skilled in the art to which the disclosure belongs thatdifferent modifications can be achieved based on the technical spirit ofthe disclosure. Further, if necessary, the above respective embodimentsmay be employed in combination.

1. A method of a user equipment (UE) in a wireless communication system,the method comprising: detecting a synchronization signal block at asynchronization signal block candidate location determined according tosubcarrier spacing of synchronization signal blocks; and performingsynchronization based on the synchronization signal block.
 2. The methodof claim 1, wherein indexes of first symbols of the synchronizationsignal block candidate location are 4, 8, 16, and 20 when the subcarrierspacing is 30 kHz, and wherein indexes of first symbols of thesynchronization signal block candidate location are 4, 8, 16, and 20when the subcarrier spacing is 120 kHz.
 3. The method of claim 1,further comprising identifying frequency band information according tothe detected synchronization signal block, wherein the subcarrierspacing applied to a control channel and a data channel is determinedbased on the frequency band information.
 4. The method of claim 1,wherein the synchronization signal block includes four symbols.
 5. Amethod of a base station (BS) in a wireless communication system, themethod comprising: transmitting a synchronization signal block at asynchronization signal block candidate location determined according tosubcarrier spacing of the synchronization signal block, whereinsynchronization is performed based on the synchronization signal block.6. The method of claim 5, wherein indexes of first symbols of thesynchronization signal block candidate location are 4, 8, 16, and 20when the subcarrier spacing is 30 kHz, and wherein indexes of firstsymbols of the synchronization signal block candidate location are 4, 8,16, and 20 when the subcarrier spacing is 120 kHz.
 7. The method ofclaim 5, wherein frequency band information is identified according tothe synchronization signal block and the subcarrier spacing applied to acontrol channel and a data channel is determined based on the frequencyband information.
 8. The method of claim 5, wherein the synchronizationsignal block includes four symbols.
 9. A user equipment (UE) in awireless communication system, the UE comprising: a transceiver, and acontroller configured to: detect a synchronization signal block at asynchronization signal block candidate location determined according tosubcarrier spacing of the synchronization signal block, and performsynchronization, based on the synchronization signal block.
 10. The UEof claim 9, wherein indexes of first symbols of the synchronizationsignal block candidate location are 4, 8, 16, and 20 when the subcarrierspacing is 30 kHz, and wherein indexes of first symbols of thesynchronization signal block candidate location are 4, 8, 16, and 20when the subcarrier spacing is 120 kHz.
 11. The UE of claim 9, whereinthe controller is configured to identify frequency band informationaccording to the detected synchronization signal block, and wherein thesubcarrier spacing applied to a control channel and a data channel isdetermined based on the frequency band information.
 12. The UE of claim10, wherein the synchronization signal block includes four symbols. 13.A base station (BS) in a wireless communication system, the BScomprising: a transceiver, and a controller configured to: transmit asynchronization signal block at a synchronization signal block candidatelocation determined according to subcarrier spacing of thesynchronization signal block, wherein synchronization is performed basedon the synchronization signal block.
 14. The BS of claim 13, whereinindexes of first symbols of the synchronization signal block candidatelocation are 4, 8, 16, and 20 when the subcarrier spacing is 30 kHz, andwherein indexes of first symbols of the synchronization signal blockcandidate location are 4, 8, 16, and 20 when the subcarrier spacing is120 kHz.
 15. The BS of claim 13, wherein frequency band information isidentified according to the synchronization signal block, the subcarrierspacing applied to a control channel and a data channel is determinedbased on the frequency band information, and the synchronization signalblock includes four symbols.